The File tab provides access to common file actions, such as New, Open, and Save. It also allows you to manage files using more advanced tools, such as Export and Publish.
Click File tab.
To see choices for each menu item, click the arrow to its right. Then click the desired item in the list.
As a shortcut, you can click the main buttons in the menu (on the left) to perform the default operation.
Recent Documents
Click File tab 
Recent Documents to see a list of recently opened files. Use the drop-down list to change the sort order of recent documents. Use the push pins to keep documents on the list, regardless of how recently you opened them.
Open Documents
Click File tab Open Documents to see a list of all open views in open files. Select a view from the list to display it in the drawing area.