In File Manager, select the icon of the folder for which you want to set an optional ACL Default entry type.
Choose Properties from the File Manager Selected menu or from the icon's pop-up menu (displayed by pressing Shift+F10 or mouse button 3).
Click the Show Access Control List button if the folder has no ACL defined.
If the folder has an ACL defined, it will be visible when you open the Permissions dialog box.
Click Add and select an ACL entry of type Default User or Default Owning Group.
If the ACL does not contain the required default entries, they will also be created, with permissions set to no-read, no-write, no-execute.
Click the Permission check boxes to set the permissions for the Default entry.
Click Add in the Add Access List Entry dialog box.
Continue to add as many ACL entries of type Default User or Default Owning Group as you want.
Use the Apply Changes To option button to choose the scope of the changes.
The options are This folder only (default) and This folder and its Subfolders.
Click OK to apply the current settings and dismiss the dialog box. Click Apply to apply the settings without dismissing the dialog box.