1. Find "Brightness"
Slide your finger downwards starting from the top of the screen.
Press the settings icon.
Press Display.
Press Brightness.
2. Turn automatic brightness on or off
Press the indicator next to "Adaptive brightness" to turn the function on or off.
3. Adjust screen brightness manually
Press the plus icon or the minus icon to select the required brightness.
4. Return to the home screen
Press the crown to return to the home screen.