Resetting RAID configuration?!

So with the ZumaCube, I had ZimaOS installed and I created a RAID 5 and a RAID 1. I was very surprised to see the RAID structure survive the re-install of ZimaOS and now an installation of TrueNAS Scale.

Since I have nothing on the drives I care about (just playing around), how does one go about removing the existing RAID setup? I want to try creating RAIDs with other OS versions (TrueNAS, UnRAID, etc…)

Since it is surviving the OS changes, I guessing this is in the “BIOS” or firmware? If not, how does one go about removing the existing RAID configurations?

In the ZimaOS system, you can dissolve and disable the raid and then format a single hard disk, both clear raid configuration information.