The only way to get access to all compatibility options in Word 2013 is to set compatibility mode to Word 2010 or earlier.
Here's how to do it: Make sure the document you want to convert is the active document. Press Alt+F11 to display the Visual Basic Editor. Press Ctrl+G to activate the Immediate window. Type
Code:
ActiveDocument.SetCompatibilityMode wdword2010
and press Enter. Close the Visual Basic Editor. You'll see "Compatibility Mode" on the status bar; then click click File tab | Options | Advanced and scroll down to the bottom of the dialog box. For "Lay out this document as if created in," choose "Microsoft Word 2010," and then you get access to the compatibility options.