There are three standard page layouts
to choose from. We recommend the Three Column Layout
for most regular pages or the Two Column Layout
if your site uses constrained layouts (Three Column will not be available in your layouts menu if your site has constrained layouts).
Steps for changing the page layout
You can change a page’s Page Layout after you have logged in
and are editing the page (click the Edit icon or click on the Site Actions dropdown menu and select Edit Page).
In the ribbon, click on the Page tab and click the Page
Select the layout you want and wait for the page to refresh.
You can learn more about the different page layout options
When you are done editing the page, don’t forget to Save
& Close and Check In.