"For Modern style recommended image width is 900px (1200px without sidebar) You can set image size in WooCommerce > Settings > Products > Display > Single Product Image"
if you go to customier>woocommerce>product images then you have the option to change the image size, remeber that this size cannot be larger that the originl image.
Try showing us on a screenshot which image you want to change exactly.
Sadly, it will not be possible with the theme options - this is how this style is made.
You will be able to change it with the CSS code, but it will be not a good solution because you would have to change a lot of things (including RWD behavior) and after that changes, it will look just like other available style.
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Comments
You can set image size in WooCommerce > Settings > Products > Display > Single Product Image"
More information HERE
Notice!
Remember to use thumbnail regeneration after you make your changes. Otherwise, the images will not change their size.
thanks