Windows boot option missing after installing redhat/ centos in dualboot
Check that windows is detected. Run following command:
If Windows was listed anywhere, lets save the new configuration file by first making a backup first, just in case.
sudo cp /boot/grub2/grub.cfg /boot/grub2/grub.cfg.old
save the config file:
sudo grub2-mkconfig -o /boot/grub2/grub.cfg
Reboot your system, now you must see Windows option in boot menu.