Hi Andrew Mackenzie , thank you for submitting to our Ucraft Forum!
As far as we can tell one of our awesome team members has been covering your inquiries via the Live Chat Service
Not to keep our other Community members in the dark, you can simply click on the Product Element > General Settings > Aspect Ratio > choose the size combination that works the best for your product images. You can opt for various ratios showcased in the screenshot below
The aforementioned settings apply to the Products Element, however you can also set up the Image Size and Aspect Ratio for your Single Product page. Simply click on a specific product title to be navigated to its single product page, expand the Product Settings > Layout Settings and choose from 100%, 50%, 25% variations.
Here's an article for more insight on the eCommerce Elements!
Feel free to let us know if anything else comes up!