I want to set up more than one external display
How do I set up more than 1 external display with a MacBook Air M1?
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You are out of luck. The M1 MacBook Air supports one external display:
MacBook Air with M1 chip - Tech Specs - Apple
"Simultaneously supports full native resolution on the built-in display at millions of colors and:
One external display with up to 6K resolution at 60Hz"