Separate names with a comma.
see the man page for prlctl prlctl set <vm_id|vm_name> --bios-type <legacy|efi32|efi64|efi-arm64> In my case (arm), I use efi-arm64
I can't seem to get secure boot working with Red Hat 9. Has anyone successfully done this? I'm using Parallels 19.3.0 on an M2 Mac Studio