Before to export, check on left side of video track you have S M and a lock if you click on M you can activate or deactivate the video track, if you click on S you can play in Solo mode on the track that means this is very useful to output the video and select may be title in English or French or music or comments.
This is about same for every software.
Note if you have a movie with title in the movie you cannot do this. This work only for the title or picture that appear on a specific track.