Obtaining high resolution displays for Elementary OS guests in Hyper-V

As a sequel to my earlier post Obtaining high resolution displays for Linux guests in Hyper-V, which focussed on Linux Mint (specifically Cinnamon), I then tried Elementary OS, which has a much nicer macOS-like feel than Mint (I mostly use XFCE, rather than Cinnamon). I accept the warnings given during the Elementary OS installation that some [ ]