You can make a single folder of Movies from the library and have that as a favorite on the home screen which will combine all movies of all shares. You can hide the individual share favorites and just have the one from the Library.
Infuse usually goes by the file name, movies are usually “Title [release year]. ext”
Like “The Love Bug 1968.mkv”
TV shows are “Series [season/episode].ext”
Like “Chicago Med S01E01.mkv”
More on the naming is here
As to Plex, I don’t use it since Infuse does everything I need and I don’t have to run a separate server since Infuse does it all.
I would assume you have at least the TV shows and movies in separate directories on the drives so you can make only the movie directories shares if you want. Not sure why you’d not want Infuse to also handle the TV shows but it’s doable.
See if this Users guide helps. It tells how to add a favorite from the Library that will show all movies and how to hide favorites of other shares so you can end up with a home screen that has “Library”, “All Movies”, and if you want it “All TV shows”.
The Library share in Infuse doesn’t show specific favorites or folders. When you open the library favorite on the home screen it will show all of the videos regardless of their location as long as they are selected to be included in the Library.
With that in mind, you can then create a home screen favorite from any of the Library sorts such as “All Movies” and it will then show all movies combined in that favorite regardless of different physical locations.