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You can adjust the screen brightness to your surroundings.
1. Find "Display & Brightness"
Press Display & Brightness.
2. Adjust screen brightness
Press and drag the indicator below "BRIGHTNESS" right or left to select the required brightness level.
3. Turn automatic brightness on or off
Press Display & Text Size.
Press the indicator next to "Auto-Brightness" to turn automatic brightness on or off.
4. Return to the home screen
Slide your finger upwards starting from the bottom of the screen to return to the home screen.