How to Turn Off MacBook Keyboard Lights (3 Steps)

Locate the 'F5' button, which can be found in the top row of your MacBook's keyboard.
Press the 'F5' button to lower the lighting level of the keyboard back light. When pressed, the light-level indicator will appear on the screen, displaying the level at which the back light is presently set. Each time the 'F5' button is pressed, the back light will drop one level.
Press the 'F5' button until the back light is off and there are no blocks remaining in the light-level indicator on the screen.
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