Dual Screens
How do I use my mac as a second monitor
iMac Line (2012 and Later)
Chances are, you can’t.
What is the year and current macOS version of both your Macs?
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You cannot use your iMac as a display for your MacBook Air. macOS Big Sur and Macs newer than 2019 are not compatible with Target Display Mode.
3 replies
iMac 2019 with macOS Big Sur v. 11.6
MacBook Air 2020 with macOS Big Sur v. 11.6
Question marked as
Best answer
You cannot use your iMac as a display for your MacBook Air. macOS Big Sur and Macs newer than 2019 are not compatible with Target Display Mode.
Dual Screens