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That seems like a misconfig or a broken lid sensor or something. I’ve been using MacBooks with a single external monitor as my only display (MacBook closed) for over a decade and I’ve never had the laptop display stay on when closed with an external display. Maybe time to visit the Genius Bar?



My M1 has been like this since I got it so assumed it was by design, but perhaps not. My old macbook doesn't behave this way.




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