App permissions give you the ability to customize and control which capabilities you give apps. You can pick and choose which permissions to grant apps at the time of use.
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.
From a Home screen, swipe up to access all apps.
Navigate: Settings > Apps.
Tap the appropriate app.
If available, tap Permissions.
Tap 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, tap Cancel or Deny.
The image below is an example.