Did you run sudo grub2-mkconfig -o /boot/efi/EFI/fedora/grub.cfg? Grub.cfg is the file that matters, /etc/default/grub only tells grub2-mkconfig what to do.
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Did you run sudo grub2-mkconfig -o /boot/efi/EFI/fedora/grub.cfg? Grub.cfg is the file that matters, /etc/default/grub only tells grub2-mkconfig what to do.