Previously you could sort Shopify variants by clicking on the 'Sort Variants' link in the left-hand menu. We've moved this functionality to an action for an in-app edit.
To sort variants you can filter for the products you want to reorder, click on 'Edit Products', and then choose 'Sort Variants' from the 'Field to Edit' dropdown.
We've made this change so you can sort variants on any set of products instead of being limited to filtering by vendor.
Learn more about sorting Shopify variants.