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AI-generated summary
What I want is to be able to adjust either the MacBook's built-in screen brightness or the external display's brightness independently. There's a simple trick for this: just hold the Control key while pressing the brightness keys, and it will adjust the external display instead. In short: brightness keys alone adjust the MacBook screen; hold Control and they adjust the external display!
When you connect a MacBook to an LG Ultrafine, the brightness keys default to adjusting the laptop screen’s brightness (unless the lid is closed, obviously). What I want is to be able to adjust either the MacBook’s built-in screen or the external display independently. There’s a simple trick for this: just hold the Control key while pressing the brightness keys, and it will adjust the external display. Release the Control key and you’re back to adjusting your MacBook’s screen.
In Short:
Brightness keys alone adjust the MacBook screen; hold the Control key and they adjust the external display!
