Gridlines make it easier to add new content to a design in a way that’s consistent with the overall vision of your microsite. It brings order to a layout which allows visitors to find and navigate through information. Grids will also allow you to quickly add elements to a section because many layout decisions are addressed while building the grid structure.
In your site, navigate to the grid section. On the left-hand menu, click on the eye icon next to the number in the column count field to turn on or off the gridlines in your grid.