In the product details window when you’re adding or editing a product in one of your lists, you’ll see the “Link Optimization” toggle in the bottom left corner.
By turning this toggle on, it means we may switch the retailer if your link is out of stock. For example, if something is out of stock at Sephora and the exact same product is in stock at Ulta, your link may be switched.
If you want to be specific about the retailer, just turn the link optimization toggle off.