We sell vitamins, so the shop page default thumbnail sizes of 300×300 zoom into our product bottles to far, we would prefer something like 600hx300w px. Is there an option to modify this, I have seen it before in other themes. I tried using CSS and it seems to have just stretched/skewed the image. It also seems that wordpress may have generated a thumbnail at 300×300 that we may need to override. Any guidance would be great, we are comfortable making child theme html/php modifications and css changes if instructed.
