User Configuration > Administrative Templates > Microsoft Word 2016 > Disable Items in User Interface > Predefined
User
HKCU\software\policies\microsoft\office\16.0\word\disabledcmdbaritemscheckboxes
This policy setting allows you to disable some specific commands in Microsoft Word. Commands are buttons, menus, or other items that can be added to the Quick Access Toolbar or to the Ribbon under File tab | Options | Quick Access Toolbar or via File | Options | Customize Ribbon, respectively. If you enable this policy setting then you can specify what commands in the user interface for Word are disabled. If you disable or do not configure this policy setting, the commands in the predefined list are all enabled in Word.