Ok, that was is the missing piece of info. You don’t have 1 movie library, you have 15. I do the same thing, so I get why you do it this way. It just wasn’t clear from your description before. Deleting and recreating these would be tedious. What I mentioned about needing 1 file, is for the library.
So if “Movies - Biography” points to “Movies\Biography” you need 1 file in that “Biography” folder. So you will need 15 files, 1 in each of these folders. Same goes for TV shows if you need to change those too.