diff --git a/application/Espo/Resources/i18n/en_US/Settings.json b/application/Espo/Resources/i18n/en_US/Settings.json
index e3306b29cc..33eb22a703 100644
--- a/application/Espo/Resources/i18n/en_US/Settings.json
+++ b/application/Espo/Resources/i18n/en_US/Settings.json
@@ -235,6 +235,7 @@
         "maintenanceMode": "Only administrators will have access to the system."
     },
     "labels": {
+        "Group Tab": "Group Tab",
         "System": "System",
         "Locale": "Locale",
         "Search": "Search",
diff --git a/client/res/templates/site/navbar.tpl b/client/res/templates/site/navbar.tpl
index aabb287288..9f98d81fbf 100644
--- a/client/res/templates/site/navbar.tpl
+++ b/client/res/templates/site/navbar.tpl
@@ -11,8 +11,18 @@
         <ul class="nav navbar-nav tabs">
             {{#each tabDefsList}}
             {{#unless isInMore}}
-            <li data-name="{{name}}" class="not-in-more tab">
-                <a href="{{link}}" class="{{aClassName}}"{{#if color}} style="border-color: {{color}}"{{/if}}>
+            <li data-name="{{name}}" class="not-in-more tab{{#if isGroup}} tab-group dropdown{{/if}}">
+                <a
+                    href="{{link}}"
+                    class="{{aClassName}}"
+                    {{#if color}}
+                        style="border-color: {{color}}"
+                    {{/if}}
+                    {{#if isGroup}}
+                        id="nav-tab-group-{{name}}"
+                        data-toggle="dropdown"
+                    {{/if}}
+                >
                     <span class="short-label"{{#if label}} title="{{label}}"{{/if}}{{#if color}} style="color: {{color}}"{{/if}}>
                         {{#if iconClass}}
                         <span class="{{iconClass}}"></span>
@@ -27,17 +37,68 @@
                     <span class="full-label">{{label}}</span>
                     {{/if}}
                     {{#if html}}{{{html}}}{{/if}}
+
+                    {{#if isGroup}}
+                    <span class="fas fa-caret-right group-caret"><span>
+                    {{/if}}
                 </a>
+                {{#if isGroup}}
+                <ul class="dropdown-menu" role="menu" aria-labelledby="nav-tab-group-{{name}}">
+                    {{#each itemList}}
+                    <li data-name="{{name}}" class="in-group tab">
+                        <a
+                            href="{{link}}"
+                            class="{{aClassName}}"
+                            {{#if color}}
+                                style="border-color: {{color}}"
+                            {{/if}}
+                            {{#if isGroup}}
+                                id="nav-tab-group-{{name}}"
+                                data-toggle="dropdown"
+                            {{/if}}
+                        >
+                            <span class="short-label"{{#if color}} style="color: {{color}}"{{/if}}>
+                                {{#if iconClass}}
+                                <span class="{{iconClass}}"></span>
+                                {{else}}
+                                {{#if colorIconClass}}
+                                <span class="{{colorIconClass}}" style="color: {{color}}"></span>
+                                {{/if}}
+                                <span class="short-label-text">&nbsp;</span>
+                                {{/if}}
+                            </span>
+                            <span class="full-label">{{label}}</span>
+                        </a>
+                    </li>
+                    {{/each}}
+                </ul>
+                {{/if}}
             </li>
             {{/unless}}
             {{/each}}
             <li class="dropdown more">
-                <a id="nav-more-tabs-dropdown" class="dropdown-toggle" data-toggle="dropdown" href="#"><span class="fas fa-ellipsis-h more-icon"></span></a>
-                <ul class="dropdown-menu" role="menu" aria-labelledby="nav-more-tabs-dropdown">
+                <a
+                    id="nav-more-tabs-dropdown"
+                    class="dropdown-toggle"
+                    data-toggle="dropdown"
+                    href="#"
+                ><span class="fas fa-ellipsis-h more-icon"></span></a>
+                <ul class="dropdown-menu more-dropdown-menu" role="menu" aria-labelledby="nav-more-tabs-dropdown">
                 {{#each tabDefsList}}
                 {{#if isInMore}}
-                    <li data-name="{{name}}" class="in-more tab{{#if className}} {{className}}{{/if}}">
-                        <a href="{{link}}" class="{{aClassName}}"{{#if color}} style="border-color: {{color}}"{{/if}}>
+                    <li
+                        data-name="{{name}}"
+                        class="in-more tab{{#if className}} {{className}}{{/if}}{{#if isGroup}} dropdown tab-group{{/if}}"
+                    >
+                        <a
+                            href="{{link}}"
+                            class="{{aClassName}}"
+                            {{#if color}} style="border-color: {{color}}"{{/if}}
+                            {{#if isGroup}}
+                                id="nav-tab-group-{{name}}"
+                                data-toggle="dropdown"
+                            {{/if}}
+                        >
                             <span class="short-label"{{#if color}} style="color: {{color}}"{{/if}}>
                                 {{#if iconClass}}
                                 <span class="{{iconClass}}"></span>
@@ -52,7 +113,42 @@
                             <span class="full-label">{{label}}</span>
                             {{/if}}
                             {{#if html}}{{{html}}}{{/if}}
+
+                            {{#if isGroup}}
+                            <span class="fas fa-caret-right group-caret"><span>
+                            {{/if}}
                         </a>
+                        {{#if isGroup}}
+                        <ul class="dropdown-menu" role="menu" aria-labelledby="nav-tab-group-{{name}}">
+                            {{#each itemList}}
+                            <li data-name="{{name}}" class="in-group tab">
+                                <a
+                                    href="{{link}}"
+                                    class="{{aClassName}}"
+                                    {{#if color}}
+                                        style="border-color: {{color}}"
+                                    {{/if}}
+                                    {{#if isGroup}}
+                                        id="nav-tab-group-{{name}}"
+                                        data-toggle="dropdown"
+                                    {{/if}}
+                                >
+                                    <span class="short-label"{{#if color}} style="color: {{color}}"{{/if}}>
+                                        {{#if iconClass}}
+                                        <span class="{{iconClass}}"></span>
+                                        {{else}}
+                                        {{#if colorIconClass}}
+                                        <span class="{{colorIconClass}}" style="color: {{color}}"></span>
+                                        {{/if}}
+                                        <span class="short-label-text">&nbsp;</span>
+                                        {{/if}}
+                                    </span>
+                                    <span class="full-label">{{label}}</span>
+                                </a>
+                            </li>
+                            {{/each}}
+                        </ul>
+                        {{/if}}
                     </li>
                 {{/if}}
                 {{/each}}
diff --git a/client/src/views/admin/entity-manager/fields/icon-class.js b/client/src/views/admin/entity-manager/fields/icon-class.js
index b638aebb30..318ac11d54 100644
--- a/client/src/views/admin/entity-manager/fields/icon-class.js
+++ b/client/src/views/admin/entity-manager/fields/icon-class.js
@@ -26,7 +26,7 @@
  * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
  ************************************************************************/
 
-Espo.define('views/admin/entity-manager/fields/icon-class', 'views/fields/base', function (Dep) {
+define('views/admin/entity-manager/fields/icon-class', 'views/fields/base', function (Dep) {
 
     return Dep.extend({
 
@@ -44,15 +44,24 @@ Espo.define('views/admin/entity-manager/fields/icon-class', 'views/fields/base',
             this.createView('dialog', 'views/admin/entity-manager/modals/select-icon', {}, function (view) {
                 view.render();
                 this.listenToOnce(view, 'select', function (value) {
+                    if (value === '') {
+                        value = null;
+                    }
+
                     this.model.set(this.name, value);
+
                     view.close();
                 }, this);
             });
         },
 
         fetch: function () {
-            return {};
-        }
+            var data = {};
+
+            data[this.name] = this.model.get(this.name);
+
+            return data;
+        },
 
     });
 });
diff --git a/client/src/views/fields/array.js b/client/src/views/fields/array.js
index 941b5491c5..95ecc33dd4 100644
--- a/client/src/views/fields/array.js
+++ b/client/src/views/fields/array.js
@@ -46,6 +46,8 @@ define('views/fields/array', ['views/fields/base', 'lib!Selectize'], function (D
 
         validations: ['required', 'maxCount'],
 
+        addItemModalView: 'views/modals/array-field-add',
+
         data: function () {
             var itemHtmlList = [];
             (this.selected || []).forEach(function (value) {
@@ -70,24 +72,8 @@ define('views/fields/array', ['views/fields/base', 'lib!Selectize'], function (D
                 this.removeValue(value);
             },
             'click [data-action="showAddModal"]': function () {
-                var options = [];
-
-                this.params.options.forEach(function (item) {
-                    if (!~this.selected.indexOf(item)) {
-                        options.push(item);
-                    }
-                }, this);
-                this.createView('addModal', 'views/modals/array-field-add', {
-                    options: options,
-                    translatedOptions: this.translatedOptions
-                }, function (view) {
-                    view.render();
-                    this.listenToOnce(view, 'add', function (item) {
-                        this.addValue(item);
-                        view.close();
-                    }.bind(this));
-                }.bind(this));
-            }
+                this.actionAddItem();
+            },
         },
 
         setup: function () {
@@ -590,5 +576,26 @@ define('views/fields/array', ['views/fields/base', 'lib!Selectize'], function (D
         getSearchType: function () {
             return this.getSearchParamsData().type || 'anyOf';
         },
+
+        actionAddItem: function () {
+            var options = [];
+
+            this.params.options.forEach(function (item) {
+                if (!~this.selected.indexOf(item)) {
+                    options.push(item);
+                }
+            }, this);
+
+            this.createView('addModal', this.addItemModalView, {
+                options: options,
+                translatedOptions: this.translatedOptions,
+            }, function (view) {
+                view.render();
+                this.listenToOnce(view, 'add', function (item) {
+                    this.addValue(item);
+                    view.close();
+                }.bind(this));
+            }.bind(this));
+        },
     });
 });
diff --git a/client/src/views/modals/array-field-add.js b/client/src/views/modals/array-field-add.js
index 52eb5a9ff2..b31c842058 100644
--- a/client/src/views/modals/array-field-add.js
+++ b/client/src/views/modals/array-field-add.js
@@ -41,7 +41,7 @@ define('views/modals/array-field-add', 'views/modal', function (Dep) {
         data: function () {
             return {
                 optionList: this.options.options,
-                translatedOptions: this.options.translatedOptions
+                translatedOptions: this.options.translatedOptions,
             };
         },
 
@@ -53,16 +53,9 @@ define('views/modals/array-field-add', 'views/modal', function (Dep) {
         },
 
         setup: function () {
-
             this.header = this.translate('Add Item');
 
-            this.buttonList = [
-                {
-                    name: 'cancel',
-                    label: 'Cancel'
-                }
-            ];
-
+            this.buttonList = [];
         },
 
     });
diff --git a/client/src/views/record/detail.js b/client/src/views/record/detail.js
index 8136e5e941..b7c3a316e4 100644
--- a/client/src/views/record/detail.js
+++ b/client/src/views/record/detail.js
@@ -124,6 +124,8 @@ define('views/record/detail', ['views/record/base', 'view-record-helper'], funct
 
         panelSoftLockedTypeList: ['default', 'acl', 'delimiter', 'dynamicLogic'],
 
+        confirmLeaveDisabled: false,
+
         events: {
             'click .button-container .action': function (e) {
                 Espo.Utils.handleAction(this, e);
@@ -1085,11 +1087,21 @@ define('views/record/detail', ['views/record/base', 'view-record-helper'], funct
 
         setIsChanged: function () {
             this.isChanged = true;
+
+            if (this.confirmLeaveDisabled) {
+                return;
+            }
+
             this.setConfirmLeaveOut(true);
         },
 
         setIsNotChanged: function () {
             this.isChanged = false;
+
+            if (this.confirmLeaveDisabled) {
+                return;
+            }
+
             this.setConfirmLeaveOut(false);
         },
 
diff --git a/client/src/views/record/edit-for-modal.js b/client/src/views/record/edit-for-modal.js
index aad9c96fbd..1ed08b4d31 100644
--- a/client/src/views/record/edit-for-modal.js
+++ b/client/src/views/record/edit-for-modal.js
@@ -40,5 +40,7 @@ define('views/record/edit-for-modal', 'views/record/edit', function (Dep) {
 
         accessControlDisabled: true,
 
+        confirmLeaveDisabled: true,
+
     });
 });
diff --git a/client/src/views/settings/fields/group-tab-list.js b/client/src/views/settings/fields/group-tab-list.js
new file mode 100644
index 0000000000..e4d0cfa4df
--- /dev/null
+++ b/client/src/views/settings/fields/group-tab-list.js
@@ -0,0 +1,38 @@
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM - Open Source CRM application.
+ * Copyright (C) 2014-2020 Yuri Kuznetsov, Taras Machyshyn, Oleksiy Avramenko
+ * Website: https://www.espocrm.com
+ *
+ * EspoCRM is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * EspoCRM is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with EspoCRM. If not, see http://www.gnu.org/licenses/.
+ *
+ * The interactive user interfaces in modified source and object code versions
+ * of this program must display Appropriate Legal Notices, as required under
+ * Section 5 of the GNU General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+define('views/settings/fields/group-tab-list', 'views/settings/fields/tab-list', function (Dep) {
+
+    return Dep.extend({
+
+        noGroups: true,
+
+        noDelimiters: true,
+
+    });
+});
diff --git a/client/src/views/settings/fields/tab-list.js b/client/src/views/settings/fields/tab-list.js
index d97fd2c223..74fd5371ef 100644
--- a/client/src/views/settings/fields/tab-list.js
+++ b/client/src/views/settings/fields/tab-list.js
@@ -30,17 +30,59 @@ define('views/settings/fields/tab-list', 'views/fields/array', function (Dep) {
 
     return Dep.extend({
 
+        addItemModalView: 'views/settings/modals/tab-list-field-add',
+
+        noGroups: false,
+
+        noDelimiters: false,
+
+        setup: function () {
+            Dep.prototype.setup.call(this);
+
+            this.selected.forEach(function (item) {
+                if (item && typeof item === 'object') {
+                    if (!item.id) {
+                        item.id = this.generateItemId();
+                    }
+                }
+            }, this);
+
+            this.events['click [data-action="editGroup"]'] = function (e) {
+                var id = $(e.currentTarget).parent().data('value').toString();
+
+                this.editGroup(id);
+            }.bind(this);
+        },
+
+        generateItemId: function () {
+            return Math.floor(Math.random() * 1000000 + 1).toString();
+        },
+
         setupOptions: function () {
+            this.params.options = Object.keys(this.getMetadata().get('scopes'))
+                .filter(
+                    function (scope) {
+                        if (this.getMetadata().get('scopes.' + scope + '.disabled')) {
+                            return false;
+                        }
 
-            this.params.options = Object.keys(this.getMetadata().get('scopes')).filter(function (scope) {
-                if (this.getMetadata().get('scopes.' + scope + '.disabled')) return;
-                return this.getMetadata().get('scopes.' + scope + '.tab');
-            }, this).sort(function (v1, v2) {
-                return this.translate(v1, 'scopeNamesPlural').localeCompare(this.translate(v2, 'scopeNamesPlural'));
-            }.bind(this));
+                        if (!this.getAcl().checkScope(scope)) {
+                            return false;
+                        }
 
-            this.params.options.push('_delimiter_');
-            this.params.options.push('_delimiter-ext_');
+                        return this.getMetadata().get('scopes.' + scope + '.tab');
+                    },
+                    this
+                ).sort(
+                    function (v1, v2) {
+                        return this.translate(v1, 'scopeNamesPlural').localeCompare(this.translate(v2, 'scopeNamesPlural'));
+                    }.bind(this)
+                );
+
+            if (!this.noDelimiters) {
+                this.params.options.push('_delimiter_');
+                this.params.options.push('_delimiter-ext_');
+            }
 
             this.translatedOptions = {};
 
@@ -52,5 +94,160 @@ define('views/settings/fields/tab-list', 'views/fields/array', function (Dep) {
             this.translatedOptions['_delimiter-ext_'] = '. . .';
         },
 
+        addValue: function (value) {
+            if (value && typeof value === 'object') {
+                if (!value.id) {
+                    value.id = this.generateItemId();
+                }
+
+                var html = this.getItemHtml(value);
+
+                this.$list.append(html);
+
+                this.selected.push(value);
+
+                this.trigger('change');
+
+                return;
+            }
+
+            Dep.prototype.addValue.call(this, value);
+        },
+
+        removeValue: function (value) {
+            var index = this.getGroupIndexById(value);
+
+            if (~index) {
+                this.$list.children('[data-value="' + value + '"]').remove();
+
+                this.selected.splice(index, 1);
+                this.trigger('change');
+
+                return;
+            }
+
+            Dep.prototype.removeValue.call(this, value);
+        },
+
+        getItemHtml: function (value) {
+            if (value && typeof value === 'object') {
+                return this.getGroupItemHtml(value);
+            }
+
+            return Dep.prototype.getItemHtml.call(this, value);
+        },
+
+        getGroupItemHtml: function (item) {
+            var label = this.escapeValue(item.text || '');
+
+            var html = '<div class="list-group-item" data-value="' + item.id + '" style="cursor: default;">' +
+                '<a href="javascript:" class="" data-value="' + item.id + '" ' +
+                    'data-action="editGroup" style="margin-right: 7px;">' +
+                '<span class="fas fa-pencil-alt fa-sm"></span>' +
+                '</a>' +
+                label +
+                '&nbsp;' +
+                '<a href="javascript:" class="pull-right" data-value="' + item.id + '" data-action="removeValue">' +
+                '<span class="fas fa-times"></span>' +
+                '</a>' +
+                '</div>';
+
+            return html;
+        },
+
+        fetchFromDom: function () {
+            var selected = [];
+
+            this.$el.find('.list-group .list-group-item').each(function (i, el) {
+                var value = $(el).data('value').toString();
+
+                var groupItem = this.getGroupValueById(value);
+
+                if (groupItem) {
+                    selected.push(groupItem);
+
+                    return;
+                }
+
+                selected.push(value);
+            }.bind(this));
+
+            this.selected = selected;
+        },
+
+        getGroupIndexById: function (id) {
+            for (var i = 0; i < this.selected.length; i++) {
+                var item = this.selected[i];
+
+                if (item && typeof item === 'object') {
+                    if (item.id === id) {
+                        return i;
+                    }
+                }
+            }
+
+            return -1;
+        },
+
+        getGroupValueById: function (id) {
+            for (var item of this.selected) {
+                if (item && typeof item === 'object') {
+                    if (item.id === id) {
+                        return item;
+                    }
+                }
+            }
+
+            return null;
+        },
+
+        editGroup: function (id) {
+            var item = Espo.Utils.cloneDeep(
+                this.getGroupValueById(id) || {}
+            );
+
+            var index = this.getGroupIndexById(id);
+
+            var tabList = Espo.Utils.cloneDeep(this.selected);
+
+            this.createView('dialog', 'views/settings/modals/edit-tab-group', {
+                itemData: item,
+            }, function (view) {
+                view.render();
+
+                this.listenToOnce(view, 'apply', function (itemData) {
+                    for (var a in itemData) {
+                        tabList[index][a] = itemData[a];
+                    }
+
+                    this.model.set(this.name, tabList);
+
+                    view.close();
+                }, this);
+            });
+        },
+
+        actionAddItem: function () {
+            var options = [];
+
+            this.params.options.forEach(function (item) {
+                if (!~this.selected.indexOf(item)) {
+                    options.push(item);
+                }
+            }, this);
+
+            this.createView('addModal', this.addItemModalView, {
+                options: options,
+                translatedOptions: this.translatedOptions,
+                noGroups: this.noGroups,
+            }, function (view) {
+                view.render();
+                this.listenToOnce(view, 'add', function (item) {
+                    this.addValue(item);
+                    view.close();
+                }.bind(this));
+            }.bind(this));
+        },
+
     });
 });
diff --git a/client/src/views/settings/modals/edit-tab-group.js b/client/src/views/settings/modals/edit-tab-group.js
new file mode 100644
index 0000000000..99fc9eb8fc
--- /dev/null
+++ b/client/src/views/settings/modals/edit-tab-group.js
@@ -0,0 +1,125 @@
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM - Open Source CRM application.
+ * Copyright (C) 2014-2020 Yuri Kuznetsov, Taras Machyshyn, Oleksiy Avramenko
+ * Website: https://www.espocrm.com
+ *
+ * EspoCRM is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * EspoCRM is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with EspoCRM. If not, see http://www.gnu.org/licenses/.
+ *
+ * The interactive user interfaces in modified source and object code versions
+ * of this program must display Appropriate Legal Notices, as required under
+ * Section 5 of the GNU General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+define('views/settings/modals/edit-tab-group', ['views/modal', 'model'], function (Dep, Model) {
+
+    return Dep.extend({
+
+        templateContent: '<div class="record">{{{record}}}</div>',
+
+        setup: function () {
+            Dep.prototype.setup.call(this);
+
+            this.headerHtml = this.translate('Group Tab', 'labels', 'Settings');
+
+            this.buttonList.push({
+                name: 'apply',
+                label: 'Apply',
+                style: 'danger',
+            });
+
+            this.buttonList.push({
+                name: 'cancel',
+                label: 'Cancel',
+            });
+
+            var detailLayout = [
+                {
+                    rows: [
+                        [
+                            {
+                                name: 'text',
+                                labelText: this.translate('label', 'fields', 'Admin'),
+                            },
+                            {
+                                name: 'iconClass',
+                                labelText: this.translate('iconClass', 'fields', 'EntityManager'),
+                            },
+                            {
+                                name: 'color',
+                                labelText: this.translate('color', 'fields', 'EntityManager'),
+                            },
+                        ],
+                        [
+                            {
+                                name: 'itemList',
+                                labelText: this.translate('tabList', 'fields', 'Settings'),
+                            },
+                            false
+                        ]
+                    ]
+                }
+            ];
+
+            var model = this.model = new Model();
+
+            model.name = 'GroupTab';
+
+            model.set(this.options.itemData);
+
+            model.setDefs({
+                fields: {
+                    text: {
+                        type: 'varchar',
+                    },
+                    iconClass: {
+                        type: 'base',
+                        view: 'views/admin/entity-manager/fields/icon-class',
+                    },
+                    color: {
+                        type: 'base',
+                        view: 'views/fields/colorpicker',
+                    },
+                    itemList: {
+                        type: 'array',
+                        view: 'views/settings/fields/group-tab-list',
+                    },
+                },
+            });
+
+            this.createView('record', 'views/record/edit-for-modal', {
+                detailLayout: detailLayout,
+                model: model,
+                el: this.getSelector() + ' .record',
+            });
+        },
+
+        actionApply: function () {
+            var recordView = this.getView('record');
+
+            if (recordView.validate()) {
+                return;
+            }
+
+            var data = recordView.fetch();
+
+            this.trigger('apply', data);
+        },
+
+    });
+});
diff --git a/client/src/views/settings/modals/tab-list-field-add.js b/client/src/views/settings/modals/tab-list-field-add.js
new file mode 100644
index 0000000000..4ec3aad4da
--- /dev/null
+++ b/client/src/views/settings/modals/tab-list-field-add.js
@@ -0,0 +1,54 @@
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM - Open Source CRM application.
+ * Copyright (C) 2014-2020 Yuri Kuznetsov, Taras Machyshyn, Oleksiy Avramenko
+ * Website: https://www.espocrm.com
+ *
+ * EspoCRM is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * EspoCRM is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with EspoCRM. If not, see http://www.gnu.org/licenses/.
+ *
+ * The interactive user interfaces in modified source and object code versions
+ * of this program must display Appropriate Legal Notices, as required under
+ * Section 5 of the GNU General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+define('views/settings/modals/tab-list-field-add', 'views/modals/array-field-add', function (Dep) {
+
+    return Dep.extend({
+
+        setup: function () {
+            Dep.prototype.setup.call(this);
+
+            if (!this.options.noGroups) {
+                this.buttonList.push({
+                    name: 'addGroup',
+                    html: this.translate('Group Tab', 'labels', 'Settings'),
+                });
+            }
+        },
+
+        actionAddGroup: function () {
+            this.trigger('add', {
+                type: 'group',
+                text: this.translate('Group Tab', 'labels', 'Settings'),
+                iconClass: null,
+                color: null,
+            });
+        },
+
+    });
+});
diff --git a/client/src/views/site/navbar.js b/client/src/views/site/navbar.js
index ede30615d9..18db488e84 100644
--- a/client/src/views/site/navbar.js
+++ b/client/src/views/site/navbar.js
@@ -91,6 +91,157 @@ define('views/site/navbar', 'view', function (Dep) {
                 e.stopPropagation();
                 this.showMoreTabs();
             },
+            'click .not-in-more > .nav-link-group': function (e) {
+                this.handleGroupDropdownClick(e);
+            },
+            'click .in-more .nav-link-group': function (e) {
+                this.handleGroupDropdownClick(e);
+            },
+        },
+
+        handleGroupDropdownClick: function (e) {
+            var $target = $(e.currentTarget).parent();
+
+            if ($target.parent().hasClass('more-dropdown-menu')) {
+                e.stopPropagation();
+
+                if ($target.hasClass('open')) {
+                    $target.removeClass('open');
+
+                    return;
+                }
+
+                this.handleGroupDropdownInMoreOpen($target);
+
+                return;
+            }
+
+            if ($target.hasClass('open')) {
+                return;
+            }
+
+            this.handleGroupDropdownOpen($target);
+        },
+
+        handleGroupMenuPosition: function ($menu, $target) {
+            if (this.navbarAdjustmentHandler && this.navbarAdjustmentHandler.handleGroupMenuPosition()) {
+                this.handleGroupMenuPosition($menu, $target);
+
+                return;
+            }
+
+            var rectItem = $target.get(0).getBoundingClientRect();
+
+            var windowHeight = window.innerHeight;
+
+            var isVertical = this.getThemeManager().getParam('navbarIsVertical');
+
+            if (
+                !isVertical &&
+                !$target.parent().hasClass('more-dropdown-menu')
+            ) {
+                var maxHeight = windowHeight - rectItem.bottom;
+
+                this.handleGroupMenuScrolling($menu, $target, maxHeight);
+
+                return;
+            }
+
+            var itemCount = $menu.children().length;
+
+            if (isVertical) {
+                var tabHeight = this.$tabs.find('> .tab').height();
+            } else {
+                var tabHeight = this.$tabs.find('.tab-group > ul > li:visible').height();
+            }
+
+            var menuHeight = tabHeight * itemCount;
+
+            var top = rectItem.top - 1;
+
+            if (top + menuHeight > windowHeight) {
+                top = windowHeight - menuHeight - 2;
+
+                if (top < 0) {
+                    top = 0;
+                }
+            }
+
+            $menu.css({
+                top: top + 'px',
+            });
+
+            var maxHeight = windowHeight - top;
+
+            this.handleGroupMenuScrolling($menu, $target, maxHeight);
+        },
+
+        handleGroupMenuScrolling: function ($menu, $target, maxHeight) {
+            $menu.css({
+                maxHeight: maxHeight + 'px',
+            });
+
+            var $window = $(window);
+
+            $window.off('scroll.navbar-tab-group');
+
+            $window.on('scroll.navbar-tab-group', function () {
+                if (!$menu.get(0) || !$target.get(0)) {
+                    return;
+                }
+
+                if (!$target.hasClass('open')) {
+                    return;
+                }
+
+                $menu.scrollTop($window.scrollTop());
+            });
+        },
+
+        handleGroupDropdownOpen: function ($target) {
+            var $menu = $target.find('.dropdown-menu');
+
+            this.handleGroupMenuPosition($menu, $target);
+
+            setTimeout(function () {
+                this.adjustBodyMinHeight();
+            }.bind(this), 50);
+
+            $target.off('hidden.bs.dropdown');
+
+            $target.on('hidden.bs.dropdown', function () {
+                this.adjustBodyMinHeight();
+            }.bind(this));
+        },
+
+        handleGroupDropdownInMoreOpen: function ($target) {
+            this.$el.find('.tab-group.tab.dropdown').removeClass('open');
+
+            var $parentDropdown = this.$el.find('.more-dropdown-menu');
+
+            $target.addClass('open');
+
+            var $menu = $target.find('.dropdown-menu');
+
+            var rectDropdown = $parentDropdown.get(0).getBoundingClientRect();
+
+            var left = rectDropdown.right;
+
+            $menu.css({
+                left: left + 'px',
+            });
+
+            this.handleGroupMenuPosition($menu, $target);
+
+            this.adjustBodyMinHeight();
+
+            if (!this.getThemeManager().getParam('isVertical')) {
+                if (left + $menu.width() > window.innerWidth) {
+                    $menu.css({
+                        left: rectDropdown.left - $menu.width() - 2,
+                    });
+                }
+            }
         },
 
         isCollapsableVisible: function () {
@@ -183,12 +334,16 @@ define('views/site/navbar', 'view', function (Dep) {
         },
 
         getTabList: function () {
-            var tabList = this.getPreferences().get('useCustomTabList') ? this.getPreferences().get('tabList') : this.getConfig().get('tabList');
-            tabList = Espo.Utils.clone(tabList || []);
+            var tabList = this.getPreferences().get('useCustomTabList') ?
+                this.getPreferences().get('tabList') :
+                this.getConfig().get('tabList');
+
+            tabList = Espo.Utils.cloneDeep(tabList || []);
 
             if (this.getThemeManager().getParam('navbarIsVertical')) {
                 tabList.unshift('Home');
             }
+
             return tabList;
         },
 
@@ -209,23 +364,33 @@ define('views/site/navbar', 'view', function (Dep) {
 
             var scopes = this.getMetadata().get('scopes') || {};
 
-            this.tabList = tabList.filter(function (scope) {
-                if (~['Home', '_delimiter_', '_delimiter-ext_'].indexOf(scope)) return true;
-                if (!scopes[scope]) return false;
+            this.tabList = tabList.filter(
+                function (item) {
+                    if (!item) {
+                        return false;
+                    }
 
-                var defs = scopes[scope] || {};
+                    if (typeof item === 'object') {
+                        item.itemList = item.itemList || [];
 
-                if (defs.disabled) return;
+                        item.itemList = item.itemList.filter(
+                            function (item) {
+                                return this.filterTabItem(item);
+                            },
+                            this
+                        );
 
-                if (defs.acl) {
-                    return this.getAcl().check(scope);
-                }
-                if (defs.tabAclPermission) {
-                    var level = this.getAcl().get(defs.tabAclPermission);
-                    return level && level !== 'no';
-                }
-                return true;
-            }, this);
+                        if (!item.itemList.length) {
+                            return false;
+                        }
+
+                        return true;
+                    }
+
+                    return this.filterTabItem(item);
+                },
+                this
+            );
 
             this.quickCreateList = this.getQuickCreateList().filter(function (scope) {
                 if (!scopes[scope]) return false;
@@ -247,9 +412,39 @@ define('views/site/navbar', 'view', function (Dep) {
             this.once('remove', function () {
                 $(window).off('resize.navbar');
                 $(window).off('scroll.navbar');
+                $(window).off('scroll.navbar-tab-group');
             });
         },
 
+        filterTabItem: function (scope) {
+            if (~['Home', '_delimiter_', '_delimiter-ext_'].indexOf(scope)) {
+                return true;
+            }
+
+            var scopes = this.getMetadata().get('scopes') || {};
+
+            if (!scopes[scope]) {
+                return false;
+            }
+
+            var defs = scopes[scope] || {};
+
+            if (defs.disabled) {
+                return;
+            }
+
+            if (defs.acl) {
+                return this.getAcl().check(scope);
+            }
+            if (defs.tabAclPermission) {
+                var level = this.getAcl().get(defs.tabAclPermission);
+
+                return level && level !== 'no';
+            }
+
+            return true;
+        },
+
         setupGlobalSearch: function () {
             this.globalSearchAvailable = false;
             (this.getConfig().get('globalSearchEntityList') || []).forEach(function (scope) {
@@ -491,23 +686,73 @@ define('views/site/navbar', 'view', function (Dep) {
 
             minHeight = Math.max(minHeight, moreHeight);
 
+            var tabHeight = this.$tabs.find('> .tab').height();
+
+            this.tabList.forEach(function (item, i) {
+                if (typeof item !== 'object') {
+                    return;
+                }
+
+                var $li = this.$el.find('li.tab[data-name="group-'+i+'"]');
+
+                if (!$li.hasClass('open')) {
+                    return;
+                }
+
+                var tabCount = (item.itemList || []).length;
+
+                var menuHeight = tabHeight * tabCount;
+
+                if (menuHeight > minHeight) {
+                    minHeight = menuHeight;
+                }
+            }, this);
+
             this.$body.css('minHeight', minHeight + 'px');
         },
 
         adjustBodyMinHeightHorizontal: function () {
-            var height = this.getNavbarHeight();
+            var minHeight = this.getNavbarHeight();
 
             this.$more.find('> li').each(function (i, el) {
                 var $el = $(el);
+
                 if (!this.isMoreTabsShown) {
-                    if ($el.hasClass('after-show-more')) return;
+                    if ($el.hasClass('after-show-more')) {
+                        return;
+                    }
                 } else {
-                    if ($el.hasClass('show-more')) return;
+                    if ($el.hasClass('show-more')) {
+                        return;
+                    }
                 }
-                height += $el.height();
+
+                minHeight += $el.height();
             }.bind(this));
 
-            this.$body.css('minHeight', height + 'px');
+            var tabHeight = this.$tabs.find('.tab-group > ul > li:visible').height();
+
+            this.tabList.forEach(function (item, i) {
+                if (typeof item !== 'object') {
+                    return;
+                }
+
+                var $li = this.$el.find('li.tab[data-name="group-'+i+'"]');
+
+                if (!$li.hasClass('open')) {
+                    return;
+                }
+
+                var tabCount = (item.itemList || []).length;
+
+                var menuHeight = tabHeight * tabCount;
+
+                if (menuHeight > minHeight) {
+                    minHeight = menuHeight;
+                }
+            }, this);
+
+            this.$body.css('minHeight', minHeight + 'px');
         },
 
         afterRender: function () {
@@ -551,6 +796,9 @@ define('views/site/navbar', 'view', function (Dep) {
             if (handlerClassName) {
                 require(handlerClassName, function (Handler) {
                     var handler = new Handler(this);
+
+                    this.navbarAdjustmentHandler = handler;
+
                     handler.process();
                 }.bind(this));
             }
@@ -606,6 +854,7 @@ define('views/site/navbar', 'view', function (Dep) {
 
         setupTabDefsList: function () {
             var tabDefsList = [];
+
             var moreIsMet = false;
             var isHidden = false;
 
@@ -614,16 +863,32 @@ define('views/site/navbar', 'view', function (Dep) {
                 this.getPreferences().get('tabColorsDisabled') ||
                 this.getConfig().get('scopeColorsDisabled') ||
                 this.getConfig().get('tabColorsDisabled');
+
             var tabIconsDisabled = this.getConfig().get('tabIconsDisabled');
 
+            var params = {
+                colorsDisabled: colorsDisabled,
+                tabIconsDisabled: tabIconsDisabled,
+            };
+
+            var vars = {
+                moreIsMet: false,
+                isHidden: false,
+            };
+
             this.tabList.forEach(function (tab, i) {
                 if (tab === '_delimiter_' || tab === '_delimiter-ext_') {
-                    if (!moreIsMet) {
-                        moreIsMet = true;
+                    if (!vars.moreIsMet) {
+                        vars.moreIsMet = true;
+
                         return;
                     } else {
-                        if (i == this.tabList.length - 1) return;
-                        isHidden = true;
+                        if (i == this.tabList.length - 1) {
+                            return;
+                        }
+
+                        vars.isHidden = true;
+
                         tabDefsList.push({
                             name: 'show-more',
                             link: 'javascript:',
@@ -631,53 +896,104 @@ define('views/site/navbar', 'view', function (Dep) {
                             className: 'show-more',
                             html: '<span class="fas fa-ellipsis-h more-icon"></span>',
                         });
+
                         return;
                     }
                 }
 
-                var label;
-                var link;
-
-                if (tab == 'Home') {
-                    label = this.getLanguage().translate(tab);
-                    link = '#';
-                } else {
-                    label = this.getLanguage().translate(tab, 'scopeNamesPlural');
-                    link = '#' + tab;
-                }
-
-                var color = null;
-                if (!colorsDisabled) {
-                    var color = this.getMetadata().get(['clientDefs', tab, 'color']);
-                }
-
-                var shortLabel = label.substr(0, 2);
-
-                var iconClass = null;
-                if (!tabIconsDisabled) {
-                    iconClass = this.getMetadata().get(['clientDefs', tab, 'iconClass'])
-                }
-
-                var o = {
-                    link: link,
-                    label: label,
-                    shortLabel: shortLabel,
-                    name: tab,
-                    isInMore: moreIsMet,
-                    color: color,
-                    iconClass: iconClass,
-                    isAfterShowMore: isHidden,
-                    aClassName: 'nav-link',
-                };
-                if (isHidden) o.className = 'after-show-more';
-                if (color && !iconClass) {
-                    o.colorIconClass = 'color-icon fas fa-square-full';
-                }
-                tabDefsList.push(o);
+                tabDefsList.push(
+                    this.prepareTabItemDefs(params, tab, i, vars)
+                );
             }, this);
+
             this.tabDefsList = tabDefsList;
         },
 
+        prepareTabItemDefs: function (params, tab, i, vars) {
+            var label;
+            var link;
+
+            var iconClass = null;
+
+            var color = null;
+
+            var isGroup = false;
+
+            var name = tab;
+
+            var aClassName = 'nav-link';
+
+            if (tab == 'Home') {
+                label = this.getLanguage().translate(tab);
+                link = '#';
+            }
+            else if (typeof tab === 'object') {
+                isGroup = true;
+
+                label = tab.text;
+                color = tab.color;
+                iconClass = tab.iconClass;
+
+                name = 'group-' + i;
+
+                link = 'javascript:';
+
+                aClassName = 'nav-link-group';
+
+                if (label.indexOf('label@') === 0) {
+                    label = this.translate(label.substr(6), 'tabs');
+                }
+            }
+            else {
+                label = this.getLanguage().translate(tab, 'scopeNamesPlural');
+                link = '#' + tab;
+            }
+
+            label = label || '';
+
+            var shortLabel = label.substr(0, 2);
+
+            if (!params.colorsDisabled && !isGroup) {
+                color = this.getMetadata().get(['clientDefs', tab, 'color']);
+            }
+
+            if (!params.tabIconsDisabled && !isGroup) {
+                iconClass = this.getMetadata().get(['clientDefs', tab, 'iconClass'])
+            }
+
+            var o = {
+                link: link,
+                label: label,
+                shortLabel: shortLabel,
+                name: name,
+                isInMore: vars.moreIsMet,
+                color: color,
+                iconClass: iconClass,
+                isAfterShowMore: vars.isHidden,
+                aClassName: aClassName,
+                isGroup: isGroup,
+            };
+
+            if (isGroup) {
+                o.itemList = tab.itemList.map(
+                    function (tab, i) {
+                        return this.prepareTabItemDefs(params, tab, i, vars);
+                    },
+                    this
+                );
+            }
+
+            if (vars.isHidden) {
+                o.className = 'after-show-more';
+            }
+
+            if (color && !iconClass) {
+                o.colorIconClass = 'color-icon fas fa-square-full';
+            }
+
+            return o;
+        },
+
         getMenuDataList: function () {
             var avatarHtml = this.getHelper().getAvatarHtml(this.getUser().id, 'small', 16, 'avatar-link');
             if (avatarHtml) avatarHtml += ' ';
@@ -765,15 +1081,24 @@ define('views/site/navbar', 'view', function (Dep) {
         },
 
         showMoreTabs: function () {
+            this.$el.find('.tab-group.tab.dropdown').removeClass('open');
+
             this.isMoreTabsShown = true;
+
             this.$more.addClass('more-expanded');
+
             this.adjustBodyMinHeight();
+
             this.trigger('show-more-tabs');
         },
 
         hideMoreTabs: function () {
-            if (!this.isMoreTabsShown) return;
+            if (!this.isMoreTabsShown) {
+                return;
+            }
+
             this.$more.removeClass('more-expanded');
+
             this.adjustBodyMinHeight();
 
             this.isMoreTabsShown = false;
diff --git a/frontend/less/espo-vertical/layout.less b/frontend/less/espo-vertical/layout.less
index 0f3a9a6816..ebbfc6937a 100644
--- a/frontend/less/espo-vertical/layout.less
+++ b/frontend/less/espo-vertical/layout.less
@@ -46,17 +46,40 @@
                 padding-right: 0;
             }
 
-            .nav > li.more > .dropdown-menu {
+            .nav > li.more > .dropdown-menu > li > ul.dropdown-menu {
+                margin-top: 0;
+            }
+
+            .nav > li.more > .dropdown-menu,
+            .nav > li.more > .dropdown-menu > li.tab-group > ul.dropdown-menu,
+            .nav > li.tab-group > .dropdown-menu {
                 top: 0;
                 left: @navbar-width;
                 padding-top: 0;
                 padding-bottom: 0;
                 position: fixed;
-                border-left-width: 0;
-                border-top-width: 0;
                 overflow-y: hidden;
             }
 
+            .nav > li.more > .dropdown-menu,
+            .nav > li.tab-group > .dropdown-menu {
+                border-left-width: 0;
+            }
+
+            .nav > li.more > .dropdown-menu {
+                border-top-width: 0;
+            }
+
+            .nav li.tab-group {
+                span.full-label {
+                    padding-right: 8px;
+                }
+
+                .group-caret {
+                    position: absolute;
+                }
+            }
+
             ul.tabs {
                 width: @navbar-width;
                 margin-left: 0;
@@ -369,7 +392,8 @@ body {
         }
 
         #navbar {
-            .nav > li.more > ul.dropdown-menu {
+            .nav > li.more > ul.dropdown-menu,
+            .nav > li.tab-group > .dropdown-menu {
                 left: @navbar-minimized-width;
             }
 
@@ -432,6 +456,10 @@ body {
                     left: -1px;
                     visibility: visible;
                 }
+
+                > li.tab-group .group-caret {
+                    right: 5px;
+                }
             }
 
             .navbar-right {
diff --git a/frontend/less/espo/elements/navbar.less b/frontend/less/espo/elements/navbar.less
index 26f8542c22..df196c1e56 100644
--- a/frontend/less/espo/elements/navbar.less
+++ b/frontend/less/espo/elements/navbar.less
@@ -36,6 +36,16 @@
         top: -2px;
     }
 
+    ul.tabs {
+        li > a > .group-caret {
+            position: absolute;
+            top: 13px;
+            right: 13px;
+            font-size: 12px;
+            opacity: 0.6;
+        }
+    }
+
     @media screen and (min-width: @screen-sm-min) {
         .tabs > .more {
             li.show-more a {
@@ -131,6 +141,39 @@
                         }
                     }
                 }
+
+                > li > a > span.full-label,
+                li > a > span.full-label {
+                    display: inline-block;
+                    text-overflow: ellipsis;
+                    max-width: calc(100%);
+                    overflow: hidden;
+                    white-space: nowrap;
+                }
+            }
+
+            li > a > .group-caret {
+                -webkit-transform: rotate(90deg);
+                -moz-transform: rotate(90deg);
+                -ms-transform: rotate(90deg);
+                -o-transform: rotate(90deg);
+                transform: rotate(90deg);
+            }
+
+            li > a {
+                height: @navbar-height-xsmall;
+            }
+
+            li.tab-group {
+                background-color: @navbar-inverse-bg;
+
+                > a > .full-label {
+                    padding-right: 8px;
+                }
+            }
+
+            li.tab-group.open > a {
+                background-color: @navbar-inverse-link-active-bg;
             }
         }
 
diff --git a/frontend/less/espo/layout.less b/frontend/less/espo/layout.less
index a788ba5747..9c42c53853 100644
--- a/frontend/less/espo/layout.less
+++ b/frontend/less/espo/layout.less
@@ -49,11 +49,15 @@
             display: inline;
         }
 
-        > li.more {
-            > ul {
+        > li.more,
+        > li.tab-group {
+            > ul,
+            > ul > li > ul {
                 padding-top: 0;
                 padding-bottom: 0;
             }
+
+            > ul > li > ul > li > a,
             > ul > li > a {
                 padding-top: 9px;
                 padding-bottom: 9px;
@@ -75,6 +79,10 @@
                 display: none;
             }
         }
+
+        li.tab-group .group-caret {
+            position: absolute;
+        }
     }
 
     .navbar-right {
@@ -175,6 +183,36 @@
             border-color: transparent;
             padding-left: 15px - @navbar-color-border-width;
         }
+
+        .nav > li.more > .dropdown-menu > li.tab-group > ul.dropdown-menu,
+        .nav > li.tab-group > .dropdown-menu {
+            overflow-y: hidden;
+        }
+
+        .nav > li.more > .dropdown-menu > li.tab-group > ul.dropdown-menu {
+            position: fixed;
+        }
+
+        .nav li.tab-group {
+            span.full-label {
+                padding-right: 8px;
+            }
+        }
+
+        ul.nav > li.tab-group > a {
+            > span.full-label {
+                padding-right: 10px;
+            }
+
+            > span.group-caret {
+                top: 17px;
+                -webkit-transform: rotate(90deg);
+                -moz-transform: rotate(90deg);
+                -ms-transform: rotate(90deg);
+                -o-transform: rotate(90deg);
+                transform: rotate(90deg);
+            }
+        }
     }
 }