Microsoft Word: View/Zoom
Not only can you change the size of the characters in your document, but you can also zoom in or out to get a better look at your document. Changing font size actually modifies the contents of your document. The View does not change anything other than your ability to see it better.
Your view is likely at 100% as shown in the size window of the Standard Toolbar. You can increase or decrease the size of the view (zoom in or out). Look at your percentage size to remember the current size and then experiment with selecting different sizes to view your work.
Under the Window option, clicking on Arrange all when you have more than one Word document open displays them so you can go back and forth between the documents seeing both at the same time.