For maximum flexibility, layouts are built compartmentally.
If you would like to build a defined layout, you’ll want to become familiar with The Grid. Don’t forget to check out the Visual Grid System Demo
To lay out your items within the submenu, check out Mega Submenu Layouts and the corresponding Visual Submenu Layout Demo
To configure the arrangement of the elements within a menu item, and that item within the submenu, check out the Menu Item Layouts article and the corresponding Visual Item Layout Demo