1 Find "Display & Brightness"
Press Settings.
Press Display & Brightness.
2 Adjust screen brightness
Press and drag the indicator below "BRIGHTNESS" right or left to select the required brightness level.
Press arrow left.
3 Turn automatic brightness on or off
Press Accessibility.
Press Display & Text Size.
Press the indicator next to "Auto-Brightness" to turn the function on or off.
4 Return to the home screen
Press the Home key to return to the home screen.