Docker Desktop now can use WSL 2 Backend. In this mode, you need to move the wsl data.
In my case (Windows10 with Docker Desktop) none of the above solutions helped me, but I found the solution; run these commands.
This command changes the docker directory to drive D: (don't forget to quit docker desktop first)
wsl --shutdown
wsl --export docker-desktop-data docker-desktop-data.tar
wsl --unregister docker-desktop-data
wsl --import docker-desktop-data D:\docker-new-repo\ docker-desktop-data.tar --version 2
And now you can delete .tar file
There is a very good blog post explaining everything:
https://dev.to/kimcuonthenet/move-docker-desktop-data-distro-out-of-system-drive-4cg2