Note: AutoFormat features are not available in Office Offline. The quickest way to insert a horizontal line using Word in Windows is with “AutoFormat.” It works by typing specific characters three times then pressing “Enter” to turn the characters into a horizontal line: How to Insert a Horizontal Line in Word on Windows?
From the “Format Horizontal Line” dialog box, you can modify the line’s alignment, color, width, and height.To change the line design, double-click on it.From the “Paragraph” section, select the “Borders” pull-down menu and select “Horizontal Line.”.