How to get demo pages shortcodes in Xtra theme?

Depending on demo page builder type and via visiting each demo pages you can find cog icon in right side of your screen, hover over it and click on last icon you can get that page ShortCode (for WPBakery demos) or page template (for Elementor demos) and use it on your website.

Another solution is built-in page importer feature, Please go to your website admin Dashboard > XTRA menu > Page Importer and paste demo page you want to import and click on import button.