1. Tap the Start icon or Windows button.
   
2. Tap Settings.
   
3. Tap System.
   
4. Under Brightness level, slide up or down to adjust the level of screen brightness.
   
5. You can also set the device to auto brightness by turning on the toggle for Adjust screen brightness automatically.
   
6. To turn off the auto screen rotation, toggle Lock rotation of this display on to lock screen orientation.
   
7. To unlock screen orientation, tap the Rotation Lock quick setting from the Action center.
   
8. To change the screen timeout period, tap Power & sleep from the System settings screen.
   
9. Under Sleep, tap on the Time interval field.
   
10. Select the desired Time interval.