At the moment I am still happy with my freshly configured Windows 10 StandaloneVM. But now I want to resize it from 30 GB to 60 GB. I have read the documentation on, link: https://www.qubes-os.org/doc/resize-disk-image/ . However Windows 10 StandaloneVMs are not explicitly mentioned. Therefore to make it absolutely sure I am asking about best practice on how to resize Windows 10 StandaloneVMs?
For me (in Windows 7), a two-step proceeding has worked:
First, increase the image files via the Qube manager, i.e. changing the private/system storage max. size.
Then, within windows, change the volume sizes, using the storage manager (in the computer management console) or an external tool like MiniTool Partition Wizard.
After a reboot, Windows should know and use the additional space.
Just to make sure: Create a clone before performing these operations, so you can fall back if anything goes wrong, Good luck!!!