Adding a vertical line will do the same thing. In a future article, I’ll show you how to add a vertical line to a document. Send me your question about Office.

Launch Word. To add a horizontal line to an existing document, click the File tab, select "Open" and browse to the document. Otherwise, Word opens a new page for you to work with.

How to Add a Line to a Header in Word. ... To draw a horizontal, vertical or 45-degree line, hold the "Shift" key while dragging. The line appears when you release the mouse button.