Can the order of a landing page content be different on mobile and desktop? We’d like to prioritize the mobile content when the user is on a mobile, and keep the content as is when using a desktop.
I assume you're using Guided Landing Pages.
The CSS Flexbox order: style is the best fit. Traditional float: styles may accomplish the same thing, depending on your layout. Or you can rearrange using all manner of JS.
These are assignments for your designer.
On the "order" link above, there's a list of classes with device "breakpoints" (screen size) built in to make it easy to have something be, for example, order-0 (top) for mobile and up, and order-lg-4 (4th) for "lg" (large) displays and up. The most practical way I could think of to set this up on a template without having to expose/edit the base HTML each time would be to set the mobile order in the code and then use a variable to add the breakpoint (sm, md, lg, xl) and order # (1-12) for any elements you wanted to re-arrange.