This image box(div) width is managed by the WooCommerce plugin and we cannot change it. The only way to change it, is changing the grid width of your website.
Do you remember that CSS to make your WooCommerce page full width? I told you it can make troubles later, and this is one of them - you would have to remove that CSS to make that image smaller. Thanks
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More information HERE
Notice!
Remember to use thumbnail regeneration after you make your changes. Otherwise, the images will not change their size.
The only way to change it, is changing the grid width of your website.
Do you remember that CSS to make your WooCommerce page full width?
I told you it can make troubles later, and this is one of them - you would have to remove that CSS to make that image smaller.
Thanks