Grub-customizer

You don’t need Grub Customizer to set your default boot option.
This is done in /etc/default/grub, usually without any change.

  1. Remove-uninstall Grub Customizer
  2. Compare
    normal grub and grub-btrfs relevant package files
pacman -Ql grub | grep "etc/grub.d"
pacman -Ql grub-btrfs | grep "etc/grub.d"

against
existing files

ls -1 /etc/grub.d/

and delete what does not belong to them.
3. Re-create grub.cfg

update-grub
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