The Ribbons are revealed by dragging the bottom left and right handles. They customisable controls which you can assign in the Settings Section.
The QuickPanels represent settings and actions to which one would generally want quick access, possible in the middle of a performance. They are revealed by dragging the top handles.
To close a Ribbon or QuickPanel you may either slide from the edge or – to ensure you don’t accidentally trigger a note – use the safe close buttons at the bottom.