@stormi Thanks @stormi.
I have to get used to XO. I always use XCP-ng Admin on Windows because old habits die hard, and there I cannot even select UEFI with all the Linux templates.
The magic that XO does is that it allows to use the templates, but with UEFI.
I have a VM that I've deployed with the "Other install media" option, so I just dettached the disk and reimported on the new one created by XO, with the correct template. Everything seems fine.
So my question about inheriting the template is not relevant if we use XO. Hope my understand is correct.
Thanks.