Downloaded apps designed for Android 6.0 (Marshmallow) and up only ask for permission the first time you use a feature rather than asking for permissions out of context.
Turning off certain permissions may result in basic features no longer working as intended.
To turn permissions on or off for installed apps:
From a Home screen, navigate: Apps icon > Settings > App Manager.
If Settings is unavailable, tap the Dropdown menu (located in the upper-left) then select Alphabetical. If still unavailable, refer to Manage App Icons.
Tap the appropriate app.
If available, tap Permissions.
Tap any of the available permission switches (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.
The image below is merely an example.