Turning off certain permissions may result in basic features no longer working as intended.
From a Home screen, press the Apps tray button .
Navigate: Settings > Apps & notifications > App info.
Utilize the 5-way navigation pad to highlight and the center button to select.
Select the appropriate app.
If available, Select Permissions.
Select any of the available permissions (e.g., Camera, Contacts, Location, etc.) to turn on or off .
If turning off a permission, from the 'If you deny this permission...' prompt, select CANCEL or DENY ANYWAY.
The image below is an example.