Docker VM disk size on Windows 10

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I’m running Docker on Windows 10 and got an error today that it’s full. I just have 1 image (postgresql 10.1-alpine 38.2MB) and have removed everything else. I also ran docker system prune --force which freed up 0MB.

I’ve read that it is (or was) a known issue on Windows 10, that deleting containers leaves stuff behind. However, if I go into my %USERPROFILE%.dockermachinemachinesdefault I find the VM disk file (disk.vmdk) that’s 18GB in size!

Aside from uninstalling and reinstalling, is there any way to reduce the size of this file?