Select Settings > Display.

Color Mode

Allows you to select day or night color mode. If you select the Auto option, the device automatically switches to day or night colors based on the time of day.

Brightness

Allows you to adjust the display brightness.

Display Timeout

Allows you to set the amount of idle time before your device enters sleep mode while using battery power.

Screenshot

Allows you to take a picture of the device screen. Screenshots are saved in the Screenshot folder of the device storage.