Same issue here. Plug a USB keyboard and you’ll gain control of the bios again. I think this Bios is crippled on this setting.</p>
I’m actually thinking of doing this to install manjaro and Refind and switch back to regular “Windows” bios setting. It is the only way I managed to get a Manjaro USB stick to boot.
Edit : I confirm this works. I installed manjaro and switched the setting back in the Bios.