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You can inject this custom css code to enlarge the product images:
If you wish a different size, all you need to do is change the value of the width:150px !important; from the code above.
Here's a guide on how to inject a css code: How to Inject Custom CSS Codes
You can also check out this clone of your form where I applied the css code: https://form.jotform.com/60071724040947
Do inform us if you need further assistance,