Welcome to the forum.
There are two forms of root authority in Fedora.
If you use:
then you get root privileges but only in an area limited by the Path statement belonging to the user who issues the su command.
To obtain full root privileges you need to issue the command:
That's a space and a minus sign after the su.
Edit: For reasons of security - that is restricting access by ordinary users - altering your path statement is not recommended.