Word 2013 showing two pages side by side

To view a single page at a time, select the View tab on the ribbon and click One Page.

The issue is with the zoom size. I solved this by setting the default zoom to 120%, and then only a single page is displayed by default.

To set it to 120% by default, you'd need to add a macro:

1. When viewing any Word document, press Alt+F11 to activate the Visual Basic Editor
2. Click on Normal on the left hand side
3. Select Insert -> Module

4. Copy the following code into the module:

   Sub AutoNew()
       With ActiveWindow.View
          .Type = wdPrintView
          .Zoom = 120
       End With
   End Sub
   
   Sub AutoOpen()
       With ActiveWindow.View
           .Type = wdPrintView
           .Zoom = 120
      End With
   End Sub
   

This will set the zoom percentage to 120% for every new document and for every document that you open. You can change 120 to another percentage if you prefer.

If you are in print view change to layout view then back to print view. This should reset back to a view of one page only.