The recent items navigator can be used to see the elements that you have recently opened or used.
To see the recent items, click the tab to the left of the Navigation Area. Double-clicking the item will open it in a view. When you restart the Workbench, the list of recent items will be reset and built from scratch. There can be max 50 items in the list - when this limit has been reached, the oldest item will be removed when a new is added.