Step 3: In the Keyboard tab, check if 'Use F1 and F2 keys as standard function keys' is unchecked or not. Step 1: Press Command + Spacebar in the open Spotlight search, type System Preferences, and press Return. But if they were designed to be used as standard function keys, you won't be able to use them to change brightness levels. The F1 and F2 function keys on your Mac keyboard are designed to manually change the screen brightness. ![]() You can also try manually changing the screen brightness from the slider. ![]() Step 3: Check if the “Adjust brightness automatically” option is enabled. Step 2: Click View in the lower left corner.
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