Hello @webpat,
Thank you for your inquiry. The checkout page is provided by the WooCommerce plugin. Unfortunately, it is not possible to directly edit the Checkout page in WooCommerce using a page builder such as Elementor.
However, Xstore has an option called Advanced Cart/Checkout Layout which can be found under XStore > Theme Options > Woocommerce > Cart/Checkout Layout.
You can enable it and check and select all available settings according to your needs. For reference, please see the image provided here: https://postimg.cc/56r308qr
Alternatively, you can use any third-party plugin that better meets your requirements, but please note that this is done at your own risk. Lastly, you can contact the support of the WooCommerce plugin at https://wordpress.org/support/plugin/woocommerce/.
We hope this information is helpful.
Best regards,
8Theme’s Team