In this post we will discuss how to change the page layout of a page in SharePoint 2013 site. Page Layout basically defines the structure of the page.
Also you can check out:
SharePoint 2013 default page layouts are One column, One column with sidebar, Two columns, Two columns with header, Two columns with header and footer, Three columns, Three columns with header, Three columns with header and footer etc. You can check out this article
to know more about how to create Page Layout using SharePoint Designer 2010.
Steps to change the page layout:
Edit the page (Settings -> Edit Page). Then from the FORMAT TEXT click on Text Layout and then select the page layout which you want to change.