Can a 21", 4k 2019 iMac be used as an extended monitor for a 24" M1 iMac?
I have the cables/adapters to connect the two computers, but in Display Settings I don't see the option to mirror or extend the screen through airplay.
Oddly, I can airplay/extend the screen from the 2019 to the M1, but I need to do the reverse.
Thanks!
iMac 21.5″, macOS 11.5