diff --git a/frontend/less/espo/custom.less b/frontend/less/espo/custom.less
index 3976236ecb..4b518670c3 100644
--- a/frontend/less/espo/custom.less
+++ b/frontend/less/espo/custom.less
@@ -618,6 +618,14 @@ ul.dropdown-menu {
 ul.dropdown-menu > li > a {
     padding-top: 4px;
     padding-bottom: 4px;
+
+    -webkit-user-select: none;
+    -webkit-user-drag: none;
+    -webkit-app-region: no-drag;
+    -khtml-user-select: none;
+    -moz-user-select: none;
+    -o-user-select: none;
+    user-select: none;
 }
 
 .dropdown-menu > li > a {