How can I change the order of product sizes for a Merch store?

To rearrange the order of product sizes and colors in a Printavo Merch store:

1. Click Apps on the left sidebar
2. Click Settings next to Printavo Merch
3. Select Product Variant Sorting
4. Drag 'n' drop the sizes and colors you'd like to be rearranged
5. Click Save at the bottom when you're done