Hi there,
Thanks for reaching out!
I understand that the main product images are being displayed smaller than they should, is this correct?
This is more than likely an issue being caused by your current theme. To check, you can temporarily switch your theme to a default theme, such as Storefront and see if the issue is resolved.
Should this resolve the issue, I’d suggest reaching out to the theme developers for further help with this.
Just to add – the theme you are currently using closely resembles the Storefront theme, so, should switching themes resolve the issue and you decide to stick with Storefront, you can check out the Storefront Powerpack extension.
The Storefront Powerpack extension gives you the ability to customize and style nearly every aspect of Storefront without ever touching any code ??
WooCommerce.com offers a 30-day refund policy which you can take advantage of, allowing you to test the extension, and make sure that it is what you are looking for.
Cheers!