You can set your tablet to use a dark theme so you can use your tablet in dark surroundings and not inconvenience other people. Furthermore, you can create a schedule for automatic change of theme at certain times.
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Press Display & Brightness.
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Press the indicator next to "Automatic" to turn the function on or off.
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If you turn on the function, press Options and follow the instructions on the screen to select the required period of time for Dark Mode.
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Slide your finger upwards starting from the bottom of the screen to return to the home screen.