Yes, you can. When you hide a menu for a user, the system automatically updates the restricted user list for that menu. You can hide the same menu for multiple users by selecting it in each user's form.

No, by default, admin users will still have access to all menus. There is a feature that checks if a user is an admin, and the "Hidden Menu" field will not be available for admins. .

Yes, you can hide both submenus and parent menus. However, you need to manually select each menu (parent or child) that you want to hide.