Phil Frye wrote, “I somehow changed the spacing between lines in Microsoft Word. Instead of single-spacing there is now double-spacing and it won’t allow me to move the cursor up to the empty line.” ...

You wouldn’t believe how often I get the same few questions about Microsoft Word. Perhaps the most common: “How do I change the line spacing?” I can understand the confusion. In Word 2003 and earlier, ...

I think this would be in your paragraph settings in the Home ribbon. With the Line Spacing widget, go to "Line Spacing Options" and check "Don't add space between paragraphs of the same style".