Hello, @mr-mag,
Actually, for a seller store, you have to create a multivendor store site. To make the multivendor store there are various plugins available in WordPress that allow you to create a multivendor store. Our theme is compatible with the “DOKAN Multivendor Plugin” and “WCMP” Plugins.
You can install one of these plugins from the Dashboard >> XSTORE >> Plugin Installation check the image: https://postimg.cc/kV6Q8fwZ and https://postimg.cc/9DSxv4n6
In order to know how the plugin works please check these articles for a better reference to understand.
https://xstore.helpscoutdocs.com/article/143-dokan-multivendor-plugin-with-xstore-theme
https://xstore.helpscoutdocs.com/article/144-wcmp-with-xstore-theme
Regards 8Themes Team.