The page layout refers to the arrangement of the content items on a page. Each content item is given a page code when it is created, based on the available content items according to the page layout as you see below.
The page layout can be changed by highlighting the webpage folder in the CMS on the Navigation side
, then clicking on the Edit icon on the Navigation side.
At the bottom of the page, you'll see a variable called "Page Layout" as seen below:
Select the page layout from one of the choices below.