There are two standard LU templates; one that spans the full-width of the page and one with a left navigation menu. Index or "home" pages are most often full-width.
A standard full width page will span the full width of the template at 1200px and will include a top horizontal navigation. This page consists of rows and columns to produce a layout that is driven by content and designed by the editor.
A page that includes left navigation with a content area that spans 900px. This page type will also include a top horizontal navigation and the layout is driven by content using rows and columns. The left navigation will pick up pages that reside in its site folder unless the editor marks otherwise.
The top horizontal navigation appears on every page in your site. Learn how pages are included in the menu and how you can edit this menu as needed.
The left vertical navigation is only included on left menu templates. These menus are good for folders that contain more than one page and will self-populate as you add pages to the folder. Left vertical navigation helps the visitor connect to all content/pages in a specific folder.