View Hierarchy Pane
The View Hierarchy Pane displays the hierarchy of sub-views in the view being composed.
It is sometimes much easier to select a particular view in this pane rather than by clicking in the Arena. In a deeply nested view hierarchy you may have to click several times to drill down into the view in the arena where a single click in the View Hierarchy Pane would be sufficient.
You can drag the view objects inside the hierarchy pane and drop them either at another location in the hierarchy within the same pane or drag them over to the arena. You can also drop objects from the Toolbox Pane over container objects in the hierarchy (but obviously you can't drop something into a non-container).