Grub splash screen not showing up at boot

I have had Qubes installed in a Lenovo Thinkpad X1 Carbon gen6 for a while. The machine came pre-installed with Windows 10 before I installed Qubes upon it.

Can somebody help me understand or remind me why I never see the Grub splash screen when booting up? This is not very convenient should I need to troubleshoot… . My boot screen is a Lenovo one giving me access to the bios for example.

Has this maybe something to do with the way I originally installed Qubes or with the fact the machine came pre-installed with Windows before installing Qubes?

I have played with the bios but nothing I do makes any difference.

Is there something I can do to make this Grub splash screen show up at boot as it should in a Qubes installation?

Thanks in advance.

Not caused by “Fast Boot” or “Quiet Boot” in the bios ?