Horizontal Rule Box: This option will enable the Horizontal Rule Box. This button will be added to row three of the visual editor. Usage: Placing a check in the box will enable the button in your visual editor. Unchecking the box removes the button from the editor. The popup box to define width, height and shadow. Adds the HR into the document. Note: This can be a very useful feature when separating content on a post or using it as a divider between topics. With a little CSS adjustment, we can change this to float left or right, and position it at a specific location.