Interface Customization Templates are sets of interface customization options assigned to Plesk users. You can configure custom settings for interface elements and save these settings in a template. Then, you assign the template to specific client accounts.
Default Customization Template is created automatically after Plesk installation. Initially, the default template allows user access to all interface elements of the control panel. The default template is automatically applied to all user accounts, including the administrator, if no other template is explicitly specified. The default template cannot be removed from the control panel. You can set another template as a default one. In the list of templates, the default template is displayed in bold.
Thus, to customize interface options for customers, you can either modify the default template or create own customization templates and assign them to user accounts.