#1. First, access your edit mode
Suppose your site is: elf.squarespace.com
You can add /config after to access edit mode, so the URL will be:
#2. Next, click EDIT on the top left of the site.
#3. Hover on the Header, and click EDIT SITE HEADER
#4. Next, click EDIT DESIGN on the right side
#5. Next, click on Layout
Then choose the layout you want
