I wonder if there's an easy way to convert libvirt BIOS-based VMs into UEFI VMs if I'm willing to completely destroy their disks. Deleting and recreating everything is kind of tedious.
virt-manager uses BIOS as the default option for firmware. There is an option to change this to UEFI just before installation, after the volume is set up.
However, after installation, the dropdown...