Thanks for posting your belief, Elric.
Before reading your post, I had tried setting the checkmark of the option Use EFI Boot in the Parallels Desktop configuration of the VM. When the ensuing installation process got to the window Suggested Partitioning, I clicked on the button labelled Expert Partitioner:
The Expert Partitioner showed me that the first partition, sda1, was of Type EFI boot and Filesystem Type FAT, and had the mount point /boot/efi/:
The Installation Settings also showed Boot Loader Type: GRUB2-EFI and Enable Secure Boot: true:
This accorded with the specifications in the openSUSE documentation for UEFI and GPT.
However, I am not certain that this was due to my setting the checkmark of the option Use EFI Boot in the Parallels Desktop configuration of the VM. It may also be that when I set the operating system to be openSUSE Linux in the Parallels Desktop configuration of the VM, by default the created VM would have UEFI and GPT. I suppose I or some other user (or, dare I say it, a Parallels support staffer) could test this by removing the checkmark from the option Use EFI Boot when creating a new VM with operating system openSUSE Linux.
Last edited: Oct 26, 2016