Update Responsive Self Service Procurement Layout

Hi all, our users have requested the layout for RSSP be modified so the most frequently used items are at the top of the page. I know this is possible, but have never done this before and have had zero luck finding the documentation.

Do I need to make a sandbox? Is it something with Visual Builder? Could someone share the steps and/or documentation on how to accomplish this?

Many thanks in advance!

Becca Edwards