single-product.php

Hi
Im using woocommerce
( with theme from – https://wordpress.org/themes/responsive/)
I see that the single-product.php is using a class for the content that comes from my theme.
In order to customize the page I need to know how is it integrated or where can I change the class – so I can have a single-product full page without sidebar
any idea?

thanks
pikaya

https://wordpress.org/plugins/woocommerce/