Enabling root access in fedora

 

You need to modify content of following files
/etc/pam.d/gdm
/etc/pam.d/gdm-password
You’ll find pam_succeed_if.so user != root quiet in above files, replace root with anything e.g test
I replaced root with test & was able to login to system using root.
OR Comment the entire line.
After login you’ll get following popup. Non-linuxadmins, use root login at your own risk.