When you first create the viewport, it displays the entire map. You can zoom in to display a detail for this map tile instead.
In this example, the roads were styled to display a composite style when the map is zoomed in. To learn how to do this, see the “Building A Map” tutorial, Lesson 3: Change the Display by Zoom Level.
You created an inset on one map tile and used it to display a close-up view of a detail of the map.
To continue this tutorial, go to Lesson 5: Publish The Map Book.