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Thank you very much, Obi-Wan. After installing Parallels Toolbox I can go up to 5120 x 2880 for the Windows 10 VM. There is even no need to go...
Sorry. I am running Paralles Desktop 12.2.1 and Windows 10 on an OS X 10.13.1 Retina 4K iMac. The only resolution available in the virtual machine...