Hello, @IP,
That is actually the Vendor List and coming from the plugin “WC Marketplace”, you have to Install that plugin first from XStore >> Dashboard >> Plugin Installer and then you will find the “MVX: Vendor List” widget under Appearance >> Widget, you have to set it under Shop Sidebar and then when the Vendor will register on your site and publish products then it will show in the sidebar.
This is how it works.
Regards 8Themes Team.