Many products share a similar SKU with their variants, so it’s important for products to be ordered by SKU, that way it would be easier to find products and their variants. Of course, giving clients the chance to choose how to sort, but given the chance, defaultly sorting by SKU would be better. Right now there is not even an SKU option.

Hey there! Thank you for your request.
I’m afraid this one here is a limitation of platform. The sort function comes from Shopify and so the theme will support whatever Shopify supports. Since Shopify does not have an option to sort by SKU, the theme is unable to support this feature at this time.
Here’s Shopify’s guide on the available sort-order options for more information: https://help.shopify.com/en/manual/products/collections/collection-layout#change-the-sort-order-for-the-products-in-a-collection

