I am unsure if this is possible or not - any way to filter movies using the DVR/Manage/Movies section to show only movies which are not in a collection?
Sometimes when movies are added to the library they do not show up in recently added section and can get lost easily with large libraries. I put all of mine into collections by genre but often find ones O have missed that are not in a collection and subsequently do not show in my movies library (unless I go to 'all movies'.