joe /etc/default/grub

GRUB_TIMEOUT=3
GRUB_DISTRIBUTOR=”$(sed ‘s, release .*$,,g’ /etc/system-release)”

GRUB_DEFAULT=”Fedora (4.8.6-300.fc25.x86_64) 25 (Twenty Five)”
GRUB_DEFAULT=”Fedora (4.13.16-100.fc25.x86_64) 25 (Server Edition)”
GRUB_DEFAULT=saved

GRUB_DISABLE_SUBMENU=true
GRUB_TERMINAL_OUTPUT=”console”
GRUB_CMDLINE_LINUX=”rd.lvm.lv=fedora/root rd.lvm.lv=fedora/swap rhgb quiet”
GRUB_DISABLE_RECOVERY=”true”

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