To edit dynamic drop zones easily:
Use the drop zone editor.
Click the Drop Zone button (shown below) to open the drop zone editor, which has a well for each drop zone on the menu. Drag movies or photos from the Media pane to each drop zone. For more information on using the drop zone editor, see Related Topics below.
Edit dynamic drop zones from the menu where they appear.
Make sure the menu with the dynamic drop zones is showing in the iDVD window. To see how the drop zones move on the menu, click the Motion button (to the left of the Drop Zone button). Click the Motion button again to stop the motion.
Drag the motion playhead (the tiny diamond-shaped button) along the scrubber bar (shown below) until the drop zone you want to edit is showing on the menu. If you don’t see a playhead, choose View > Show Motion Playhead.
Click the Media button and then click Movies or Images to access media to drag to the drop zone. You can also drag files stored elsewhere on your computer.
Continue in this manner until all the drop zones are filled, moving the playhead to access each drop zone.
Click the Motion button (to the left of the Drop Zone button) to see the results.