Here's a link to the FAQ on the subject https://hansdegoede.livejournal.com/20632.html https://hansdegoede.livejournal.com/20632.html It includes instructions

Here's a link to the FAQ on the subject https://hansdegoede.livejournal.com/20632.html https://hansdegoede.livejournal.com/20632.html It includes instructions to disable- 4) Getting rid of the vendor-logo/firmware-splash being shown while Fedora is booting? If you don't want the firmware-splash to be used as background during boot, you can switch plymouth to the spinner theme, which is identical to the new bgrt theme, except that it does not use the firmware-splash as background, to do this execute the following command from a terminal: "sudo plymouth-set-default-theme -R spinner" Note that the kernel will restore the vendor-logo early on at boot in case it got damaged by e.g. option ROM messages. If you are switching to the spinner theme you may also want to add "video=efifb:nobgrt" to your kernel commandline. See 7 below for how to edit the kernel commandline.