Layout Editor allows changing the default storefront layout from 1 to 3 column format and back splitting the changes between the store homepage and other site pages.
To change the page layout format:
When logged in as a store administrator, click on the Layout Editor tab at the bottom of any storefront page:
The Layout Editor tool will open.
Refer to the Storefront Layout part of the tool to change the page format.
To change the homepage format, click the Home page dropdown and select the layout you need:
To change other pages format, click the Other pages dropdown and choose the design you need:
Finally, click Save to make the changes active.