The Scenario Editor has two previews possibilities: mobile and tree.
Mobile. With this preview it is easy to see how your project is going to work. It shows every interaction and media asset as they would have been shown while running the exercise. It is not exactly as how it looks in the communicator, but it gives you an idea of how your scenario is built.
Tree. This option gives a list of the different content boxes by order. By clicking them it is possible to go directly to the box that you want to check.