It would be smart if sold out products were automatically deprioritized on the product groups.
This prevents customers from becoming interested in the products that are out of stock - and instead get their eyes on some of the ones that are in stock.
That is to say:
When an item is sold out, it is relegated to the bottom of a group of goods. And important: When it is back in stock, it is moved up to the original default sort where it came from before it was sold out/moved.
Example:
This is done today at www.med24.dk (See picture, which is at the bottom of the product group https://www.med24.dk/lea)
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