Welcome to the forum.
AFAIK there is no way to hide specific files from theater view
You can do that with
Rules for file display (for a special 'Audio + Music Video' view) something like...
[Media Type]=[Audio],[Video] ~sort=[Media Type]-d ~nodup=[Album],[Track #] ~sort=[Track #]
Assuming the audio and video files have been tagged with [Album] and [Track #] values that match correctly, this will first sort the files so the videos are first, then remove duplicates of [Album] [Track #]—effectively replacing audio files with video, if matching video exists. The list is then resorted by track #.
The feature is still experimental and has some rough edges, but the same thing can be done with
Particles set to play a specific "track" in a concert video.