Recheck all option in Bios to get only EFI
disable secureboot
disable fastboot
no CSM or Legacy
choose UEFI only or first or others ( not windows )
disks on AHCI
no optane RST
and boot in UEFI only on USB iso
you should see this
UEFI < USB vendor name > < partition 1>
open a terminal and a browser on this topic
and returns
inxi -Mza
test -d /sys/firmware/efi && echo efi || echo bios
sudo parted -l
sudo efibootmgr -v