Schematic view is a window that displays the objects in your scene in a hierarchical view. It gives you an alternate way to select and choose the objects in your scene and navigate to them.
When the Modify panel is open, double-clicking an object modifier in Schematic view navigates the modifier stack to that modifier for quick access to its parameters.
To open Schematic View and display and select objects:
You can select any number of objects in Schematic View using standard methods, including dragging a region. For more information, see Using Schematic View.