On the grub screen, `press c` to get the commandline,
and enter `vbeinfo` or `videoinfo` on EFI boot to check what resolutions you can use,
then edit `/etc/default/grub` , add your resolution `GRUB_GFXMODE=****x****x32` into it,
last you can run `grub-mkconfig -o /boot/grub/grub.cfg` to update your grub.cfg.
On the grub screen, `press c` to get the commandline, and enter `vbeinfo` or `videoinfo` on EFI boot to check what resolutions you can use, then edit `/etc/default/grub` , add your resolution `GRUB_GFXMODE=****x****x32` into it, last you can run `grub-mkconfig -o /boot/grub/grub.cfg` to update your grub.cfg.