I am surprised no one could help, but eventually I did find the place to modify this text. Yay!
Here's where it is...
Options, Theater View, Customize File Info Panel.
You would think there would be a "Customize FileLIST Panel".
There is, but you have to EDIT the Template you are using (in this case TV SHOWS). Once TVSHOWS is (are?) the item you are trying to change, then choose "MANAGE..." then "Edit Template", then change what the Caption is.
The Caption is the exact line I am trying to make bigger. Easy once here, but finding here was tough.
I thought "Manage" was a place to store and sort templates, not where you could edit part of it. So much customizability with MC. I love it. But lots of stuff you don't know exists unless you look for it. Knowing what I have now done with the Caption for TVShows, I am looking forward to what I can do with Movies
Hope this helps someone.
Don