I've taken a timeline, and saved it to my library. Then in a new project, I've added library items back into the timeline. These items are packed into nice compact blue items in the timeline, and can be expanded to full size. What I'd like to do, is re-compress them back into compact form when I want to work on other parts. Is this possible? I don't see a "plus" or "minus" to do this once the part has been un-compacted.