Depending on the theme you’ve chosen, iDVD may impose a limit of six or twelve buttons on a menu screen. Fortunately, that doesn’t mean you’re limited to twelve scenes in a movie, or twelve movies per DVD. You, or iDVD, can accommodate more movies by creating submenus—additional menu screens that branch off from the main menu—and even sub- submenus (Figure 16-8).
You may have seen this effect already, in fact, if you’ve tried to create an iMovie DVD containing more than a handful of chapter markers.
You can also create this effect manually. Whenever you choose Add Submenu from the + pop-up menu at the lower-left corner of the screen, iDVD adds a submenu button to the current menu screen. In some themes, especially those that began life in previous versions of iDVD, this button looks like an actual folder; in most, it’s simply a new text button.
Behind the scenes, this button represents a second menu screen, a blank canvas with room for yet another six or twelve buttons.
Navigating iDVD Folders while building your project is pretty easy, once you master these tips:
Open by double-clicking. Double-click any folder or submenu button to “open” it—that is, to bring up the menu screen it represents.