The "Woo Cart" section contains a single element: "Cart". It can be used just on a Woocommerce cart page. When is dropped on a different page, the element will display a red notification providing instructions to set the "Cart" page.
The "Cart" page can be set from WP Admin > Woocommerce > Settings > Checkout.
Once the "Cart" page is set properly, the "Cart" element from the "Live Composer WooCommerce Integration" will be displayed in this way: