Why does my free Wix domain still appear in search engines?
Once your site has been upgraded and you have attached your own domain, Wix erases the free domain from its sitemap. When Google re-crawls your site, it will see this change and erase the free domain from its listings as well. However this process is not immediate and might take a few weeks.
To improve results and speed up the process, Wix now also incorporates a new, automatic, no-index tag to the free domain. This will expedite its removal from the search engine listings.
You can learn more in our Wix Blog article: Why Is the Wix Domain Appearing In Google Alongside My Own Domain?