Hello,
1) Auth username and pass do not work.
We are able to log in only using the default account page https://chinastreet.lk/my-account/
2) We checked your site and see that issue appears even with the default WP theme not just with the XStore. So, our theme is not the reason of the problem. Editor appears for a second while loading https://gyazo.com/f4524d5b7cf8e819ee8397f8b94d394a but then white screen. Try to disable your authentification. Maybe this is the reason of your issue.
If it does not help then contact Elementor support https://wordpress.org/support/plugin/elementor/ because we are able to help only in case issue caused by our theme, if it does not work even with the default WordPress theme we can do nothing, unfortunately.
Regards