I just got Movies on DVD 7, and have been playing with it. But I don't get how I can close a movie without closing the entire program down. How can I do this? What am I missing or is it just not an option?
You need to make sure to distinguish between projects and movies. You can only have one project open at any point in time, but one project can contain several movies. Each movie will be represented with one entry in the main menu during the DVD-authoring.
You can close the project by picking "New disc project" from the "File" menu of the program. Since the program can only handle one project at a time, this will close the current one, offering you the chance to save it, if you haven't done so yet. A single movie can be closed via "File" menu => "Movie" sub menu => "Close movie" command. The currently selected movie will be closed and taken out of your current disc project.