When you’re finished with a file, closing it is a simple matter. And, if you forget to save it first, don’t worry: Office 2013 will remind you so that you can save your changes before closing the file.
With the file you want to close active on the screen, click the File tab to display the Backstage view.
There are two more simple ways to close a file. The first is to click the close box (the “x”) in the upper-right corner of the app window. The second way is to use the Windows 8 method and swipe down from the top of the screen, dragging the app all the way to the bottom. The app window ...