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After making changes to /etc/default/grub you have to run grub2-mkconfig -o /boot/efi?EFI/fedora/grub.cfg to generate new grub.cfg file.This will also run os-prober and automatically create entries in grub.cfg. Also you dont normally need to edit grub.cfg manually unless you want to do some kind of special tweak. This file is generated by entries in /etc/default/grub and /etc/grub.d/<files>. when you run grub2-mkconfig command.