espocrm-base/application/Espo/Modules/Crm/Resources/metadata/clientDefs/DocumentFolder.json

{
    "controller": "controllers/record-tree",
    "collection": "collections/tree",
    "menu": {
        "listTree": {
            "buttons": [
                {
                    "label": "List View",
                    "link": "#DocumentFolder\/list",
                    "acl": "read",
                    "style": "default"
                }
            ]
        },
        "list": {
            "buttons": [
                {
                    "label": "Tree View",
                    "link": "#DocumentFolder",
                    "acl": "read",
                    "style": "default"
                }
            ]
        }
    }
}