I recommend dealing with the cache drive first.
Set appdata apps domains and system to cache: yes,
go into settings, docker and vm manager, and disable them both, once that is done you shouldn't have a Docker or VMS tab in the gui,
run mover, check the shares page compute all and make sure none have cache: entries,
then change the format type on the cache drive to xfs if you only ever plan to have a single drive for cache, btrfs if you plan to add a drive for redundancy in the cache pool.
format the cache drive, make sure that's the only drive set to unmountable before checking format
set appdata apps domains and system to cache: prefer
run mover
enable docker and vm manager