The order of your Column layers in Figma will always determine how they stack on mobile (eg. any Column layers on the left will always stack on top of any columns to the right), but sometimes you may want to have a different order of these Columns on desktop.
You can achieve this effect by clicking on the Row layer you want to reverse the Column layers of on desktop, then clicking the Settings button in the plugin header menu, and enabling the Reverse column display order (on desktop) toggle.
You can visually preview your visual order column overrides using the preview HTML feature in the plugin.