Classic Commerce shared the order numbering with all other posts, so it is non-sequential and somewhat inflexible. There are ways to change this with plugins, but this code will allow you to simply add a prefix or a suffix to the number as it appears on the site and in emails. Note that the number … Read moreExtend Classic Commerce order number
The product gallery thumbnails have a default setting of 4 per row but this may not work well with your theme. The number of thumbnails per row can be set using this code.