Fill+Except Option (Quick Read)
I like to play every role, so I enjoy using Fill. However, after playing 5-6 games in a row as Support, I'd just enjoy being able to Fill any other lane.
When you pick Fill as a primary, you should be given a second option, which doesn't need to be used, but you may select to remove one role from your Fill pool.
ONLY when you pick Fill as a primary option, not as your secondary.