@kellibnnings you're asking the same question, but the answer is very different because you are on an older version of Squarespace (7) and using the classic editor. With the classic editor there is not the same direct editing capability for mobile, you're reliant mostly on getting the block order correct (top-to-bottom and left-to-right) on desktop to control the order on mobile. There are ways to control the mobile design, but that relies on specific cases and requires on careful use of CSS.
