The Screen Outline pane at the left of the Document window displays thumbnails of each screen in the current document, in a collapsible tree view. The tree represents the structural hierarchy of the document. Nested screens are indented below the screen that contains them.
When you add a screen to a document, the screen appears in the Screen Outline pane.
To hide and show nested screens, collapse and expand the tree. You can hide, show, and resize the Screen Outline pane.