Select Setup > Display.

Backlight Timeout

Sets the length of time before the backlight turns off.

Orientation Lock

Locks the screen orientation in portrait or landscape mode, or allows the screen to change orientation automatically based on the device orientation.

Auto Lock Screen

Sets the screen to lock automatically.

Battery Save

Saves the battery power and prolongs the battery life by turning off the screen when the backlight times out (Turning On Battery Save Mode).

Appearance

Sets the displayed accent colors for day and night (Appearance Settings).