I have the same problem with the latest DF Pro 2.21.993 (64 bit) on WIN10 (64 bit).
The boot disk is a Samsung 960 EVO NVMe M.2 SSD but it's listed as a NTFS HDD. Therefore I can't optimize it yet I would be able to defrag it.
The same problem in a tablet that runs DF free on WIN10 (32 bit).