Child Theme Product Zoom

When I click on a product in my shop, the image is larger than then size it is able to be displayed at. What are the proper dimensions to use for store products? And, when I click on the magnifying glass, it expands so that I can see the entire image. However, I do not want the zoom capability to make it even larger. How do I turn off the ability to zoom once the product is expanded? Here is a good example:
https://jolenedames.com/product/boraxo/
Thank you.