How to change this image?

This is a shop page from WooCommerce. You use Astra as a theme, which offers you possibilities for the design. Here is an article about it: https://wpastra.com/docs/shop-woocommerce/

If you have further questions, I would recommend contacting their support: https://www.ads-software.com/support/theme/astra/

yes, you can use AStra Seeting in the Theme Customiser or CSS