This interface can be configured and the configuration is persistent, i.e. it is remembered between program invocations. The controls for this interface consist of a Pin, a Close Box and a Tab. The Pin and Tab are related. When the Pin is “unpinned” the window slides into the main window frame and presents a Tab with the window name. When the Pin is “pinned” the window stays open and the Tab goes away.
In the unpinned configuration, hovering the cursor over the Tab reveals the window. When the cursor is moved out of the window it slides back into its unpinned position.
The Close Box dismisses the window altogether. To restore a dismissed window you must use the View Menu->Toolbars and Windows item to restore the dismissed window.
Left: Unpinned Right: Pinned
Left: Pinned Windows. Right: Reset Windows command in Menu.