Hello,

The shop page is a functional Woocommerce page. It is not editable. You cannot add any content there.

As for the sidebar size, you can change it in the Theme Settings > Product Archives > Sidebars. In addition, please click “edit” for the shop page (in WordPress, not in the Elementor) and check the sidebar settings in the page: https://xtemos.com/docs-topic/options-for-pages/

If you have any questions please feel free to contact us.

Best Regards