It’s always a good idea to preview a disc before you burn it. The Preview Disc panel contains controls that mimic those on a DVD or Blu-ray player’s remote control. By using these controls, you can test each button on the menus and view the video to which they link. You can preview a disc in a window or full-screen.
You can preview a menu-based disc at any point after dragging a template onto the Disc Layout panel.
If you are notified that buttons overlap, see Change the placement and size of menu items.