Enter the WordPress Administration page, below the Settings item you will find the:Grid WUD menu item.
It will show you a page with all the options for Grid WUD.
Some items haves a help button, which shows you the necessary information.
Simply with a mouse over action on the you get more help about this option.
Every colored option box on the left side, changes grids/tiles/galleries/widget with corresponding colors on the right side.
This picture is just to have an overview of the options.