1. From the home screen, swipe down from the Notification bar.
   
2. Tap Auto-rotate to lock/unlock the screen orientation.
   
3. To access additional display settings, tap the Settings icon.
   
4. Swipe to the DEVICE tab, then tap Display.
   
5. Tap Adaptive brightness to toggle automatic brightness on/off.
   
6. Tap Brightness level.
   
7. Drag the Brightness slider left or right to adjust the brightness manually.
   
8. Tap Sleep to change the screen timeout.
   
9. Tap the desired option.