Type 'exit' to return to the UEFI settings menu, then select Boot Maintenance Manager. From there, select Boot From File, then navigate to and boot from /EFI/[distro name]/grubx64.efi (where [distro name] will be ubuntu, arch, debian, etc). Once your OS is booted, open a terminal/shell, and type the following (observing case):

sudo su

mkdir -p /boot/efi/EFI/BOOT

cp /boot/efi/EFI/[distro name from above]/grubx64.efi /boot/efi/EFI/BOOT/BOOTX64.efi

If using GalliumOS it works on efi no problems but other distros probably have this problem the Asus c300 Chromebook I had now on efi with GalliumOS and runs indie games off steam with no issues for my wife