I got it to work by selecting Grub.
Now I'm trying to remove it by using the ventoy-delete-key-1.0.iso, but after the message "The Ventoy Key has been successfully marked for deletion", it reboots, but then loads Windows rather than the MOKManager that it says should load. So I can't finish the key removal process. I tried to use Boot in Grub2 mode but it gave an error: No bootfile found for UEFI! Maybe the image does not support x64 UEFI
Now I'm trying to remove it by using the ventoy-delete-key-1.0.iso, but after the message "The Ventoy Key has been successfully marked for deletion", it reboots, but then loads Windows rather than the MOKManager that it says should load. So I can't finish the key removal process. I tried to use Boot in Grub2 mode but it gave an error: No bootfile found for UEFI! Maybe the image does not support x64 UEFI