Hello, @oscardc,
Thanks for using our Theme.
1- There is an error on your site the checkout page does not appear and working fine please check the image: https://postimg.cc/dk9sfzD4
kindly fix it first so that I will be able to check your issue and fix it for you.
2- This is not part of the XStore theme functionality, this panel was created just for the Preview page on ThemeForest. So you cannot set this from the theme options. I hope you understand.
Regards 8Themes Team.