After almost 22 years of making Microsoft Office for various platforms, Microsoft has bafflingly never provided an Insert > Horizontal Line option.
The ‘three dashes and enter’ trick does not work on Office for Mac 2011. However, there is indeed a way to insert a horizontal line to your Word document. I’ll show you how!
In the top ribbon menu, click on Home and then the Grid Box icon. Choose Bottom to create a horizontal line at the location of your cursor.