sort by duplicates which will display ones where it thought it was two or more copies/versions of the same movie
Otherwise generally it will movies with parts that might gotten combined as two halves of a movie because of how file naming rules work. Unfortunately there is no easy sort for that as they are not considered duplicates/versions. Files with named the same other wise but end in part1, part2, or a view other variations, are treated as one file for playback in apps that support it https://support.plex.tv/articles/naming-and-organizing-your-movie-media-files/#toc-3 . I’m not sure if webtools has an report for that. cc @dane22