Use iMac as a display in target display mode
I have a 2020 MacBook Pro with Intel processor, 2 ThunderBolt-3 ports, running Catalina. Can I use a Thunderbolt 3 to Thunderbolt 2 adapter to connect to an iMac 2013 running High Sierra?
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No. The source computer must be a 2019 model or earlier to support Target Display mode.
click here ➜ Use your iMac as a display with target display mode - Apple Support