Extends the admin role with a new, awesomer role called ‘Sysadmin’. This new role gives you a menu of options to hide menu and/or sub-menu items in the admin from all other users (e.g. Themes, Theme Editor, Plugin Editor, etc.) Very useful when restricting major changes or updates from clients or administrators.
Just deactivate and delete plugin. This will re-assign Sysadmin role as Administrator and remove all options (unhiding hidden menu items, etc.)