Click on the arrow to the left to collapse the menu
Now, click on the arrow to the left to expand the menu
As you view the items and links presented in a course, use the breadcrumbs to navigate to previous pages. The breadcrumbs appear above the content frame. Click the ellipsis to expand the list.
Using the "back" button to go back to a higher level menu/folder can produce unpredictable results in a system with dynamically generated pages--that's the reason the "breadcrumb trail" is displayed at the top of the frame.