UR: Push Down Out of Stock

Sold-out items at the top of a collection take up the first rows and make shoppers scroll past things they can't buy. Turn it on per collection and sold-out products move to the end automatically, while the rest keep your current order. When stock comes back, items return to where they were, and newly added products are placed above sold-out ones. Choose what counts as sold out, skip pre-order items or tagged products, and restore the original order anytime. No theme changes needed.