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?
3 replies
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.
iMac 2019 with macOS Big Sur v. 11.6
MacBook Air 2020 with macOS Big Sur v. 11.6
Dual Screens