  The navigation pane
When the navigation pane is open, it is displayed to the left of the main pane.
Opening the navigation pane
To open or close the navigation pane, click this button:
 This button is a toggle.
The tree view
The tree view displays containers and any other objects that you would see at the top of a main pane split into two panes. You can open and close containers using the tree view buttons (Windows, Linux) or disclosure triangles (Mac), just as you would normally do in your operating system.
If you click a container in the tree view, that container's contents are displayed in the main pane. If you double-click a container in the tree view, the container's contents are displayed in the same page.
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