Hi.
This topic might help:
https://forum.qubes-os.org/t/uefi-boot-no-qubes-os-option/4168
try first the 5th post:
https://forum.qubes-os.org/t/uefi-boot-no-qubes-os-option/4168/5
If that doesn’t work, try the 3rd post:
https://forum.qubes-os.org/t/uefi-boot-no-qubes-os-option/4168/3