Product gallery image always appears as thumbnail and it gets bigger or slides on click event. It is a default nature of the WooCommerce plugin. To change the product gallery image size would require custom development. I would suggest you contact a developer who can assist you with your concern. Please note that we don’t provide custom development support. It is out of the support scope.
We’re glad that you’re able to figure it out! If you have any other concerns or clarifications regarding our theme features, feel free to open up a new thread.