Naming a folder to be picked up as a collection of items and not a series?

[Iskelderon]

Nesting folders in the Shows or Movie libraries is not recommended nor supported.  If you MUST have this type of organization, you would need to use something like the Music Videos library type that just shows the folders and file names but does not scrape online DBs.

It's pretty much the only solution for franchises that have both types (e.g. Star Trek, Star Wars, Marvel...), unless you want to make your collection less comfortable to navigate because you have to move things to separate libraries just to work around this shortcoming.