I have small, medium, and large sizing as my variants. If small sells out, that product on the category page shows the product as being sold out. I would need to click on the "sold old" product from the category page to enter that specific product's page. Once there, I would need to change the variant from small. Once the variant is changed the product shows in-stock and can be purchased. I am losing major traffic on the products that have this issue, as customers think the entire product is sold out, but in reality only the first variant is sold out. How can I fix this? Thanks for your help.