Use iMac 2017 as display for Mac Mini M1
How to use the iMac (Retina 5K, 27-inch, 2017) as a display for Mac Mini M1 (2020)?
Mac mini, macOS 12.2
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No sorry, the 2020 M1 Mac mini does not support using the iMac as a display in Target Display Mode.
carefully read > Use your iMac as a display with target display mode - Apple Support
If your purchasing an M1 Mac mini or Mac Studio, then you will also need an aftermarket display.