You can easily add an accent line to your page. To do so, select the "Add More" option and select Line.
Clicking on this option will prompt you to select the area you want to add the line. Once added, you can adjust the Color, Thickness, Pattern (Solid, Dashed or Dotted), and the Caps (Square or Round).
In addition, you can click and drag on the end points to change the length or click on the small box at the top of the line to rotate it. To remove a line, simply click on the line, click the delete key on your keyboard or click the Remove Line option in red at the top of the Edit Line sidebar.
The icons at the bottom of the sidebar allow you to position the line with respect to other items on the page, either to bring it forward or backward.