The goal of this is to bring expandable/collapsible notebooks to the terminal app, functionality that is on the desktop application and extremely useful when dealing with large or complex notebook hierarchies.

• The terminal app should be able to 'fold' or 'collapse' notebooks (folders) displayed on the left panes and expand collapsed notebooks.
• The app should remember which notebooks have been left collapsed or expanded between sessions
• If using the use command to select a notebook that is currently within a collapsed notebook then it should be displayed in the pane by expanding its parent notebooks
• There should be some kind of visual indication that a notebook is currently collapsed or expanded