If you're already in a file and want to come back to Backstage view to print, save, open another file, or any other task, select the File tab. The File tab is a colored tab, for example, a blue tab in Word, located in the upper-left corner. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.