The "Uninstall Krita" menu item is included in the Windows Store release, which should not have happened. I asked Boud to send me some info and I'll try to see what we can do about it.
I'm using the msix packaging tool (https://docs.microsoft.com/en-us/windows/msix/packaging-tool/tool-overview) to create the msix package from the setup.exe on the local machine, because the vm option never worked for me.
Fixed with the 4.3.0 release.