How your demo sites looking completely different??

Hi @rahulkapoordelhi86 , thank you for getting in touch with us!

First of all, plugins serve the core, modularity, and functionality purpose and the theme is responsible for design and templating. Anyways, you might have seen our pro themes or best listing free theme demo, and using the GeneratePress theme you will not be able to use that design inside your third-party themes. Third-party themes and our ready-made shortcodes (plugin activated) will also appear in the default design of our plugin and this is how it actually works.

Shortcodes: https://directorist.com/documentation/directorist/shortcodes/all-listing-page/
Single Listing Page Customization: https://directorist.com/documentation/directorist/form-and-layout-builder/custom-single-listing-page/

Feel free to let me know for more help.

Regards,
Sheikh Faysal