GRUB 2¶

Recreate Grub-Menu¶

for BIOS-systems

grub2-mkconfig -o /boot/grub2/grub.cfg

on EFI-systems

grub2-mkconfig -o /boot/efi/EFI/centos/grub.cfg

make detailed boot-information visible¶

while it's possible to edit '/boot/grub2/grub.cfg' and also '/etc/default/grub' the better approach is to:

plymouth-set-default-theme details
dracut -f