The Outline view displays an outline of a structured file that is currently active in the code editor, and lists structural elements. The contents of the Outline view are language specific. A Python buffer displays, among other things, imports, classes and methods while a MEL buffer displays global variables and procs (global and local)
The Outline can be used to quickly navigate to specific elements in the code. Clicking on an item will move the cursor to the location of the element in the editor.