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Big Sur is running under Parallels 17 on my Mojave Mac but the network doesn't work (it's on shared network) and the display is stuck at 1024x768....
Because I was unable to work with any of my virtual machines I reinstalled Parallels v14 and everything worked fine. I've since reinstalled v17...
I installed the v17 demo on my Mojave machine and then installed Big Sur as a virtual machine. All went well except I wasn't able to get Big Sur...