In order to bring up the boot menu in Grub2 you press any key. This is a choice made after BIOS boot selection (if on EFI/UEFI BIOS). I am running Silverblue on F33 Rawhide compose 33.20200914.n.0 (2020-09-14T08:05:11Z) (915,916, and 917 won't boot) and it works on my bare metal setup.

Regards,

Stephen

On Fri, Sep 18, 2020 at 08:29, Kamil Paral <kparal@redhat.com> wrote:

On Thu, Sep 17, 2020 at 10:14 PM Chris Murphy <lists@colorremedies.com> wrote:
holding shift key down does not reveal GRUB menu (edit)
https://bugzilla.redhat.com/show_bug.cgi?id=1880169

I'm not sure when this regression appeared. It was working with F32
VM's and I think also with some earlier F33 VMs.

Anyway, right now it's not working for me with either virt-manager or
baremetal (sample size of one each).

What about quickly pressing F8? On my baremetal, Shift doesn't work either. But as I remember, many BIOSes simply ignore keys which are pressed down during initialization, to prevent "stuck keys". That's why there are two different key options to display GRUB.