1. From the home screen, swipe down from the top of the screen with two fingers, then tap Auto-rotate to lock/unlock the screen orientation.
   
2. To access additional display settings, tap the Settings icon.
   
3. Scroll to and tap Display.
   
4. Tap Brightness level.
   
5. Drag the Brightness slider left or right to adjust the brightness manually. 
   
6. Tap the Adaptive brightness toggle to turn automatic brightness on/off. 
   
7. Tap Sleep to change the screen timeout.
   
8. Tap the Desired option.