Put simply, this update to SERPs means that if your site’s page is currently occupying a featured snippet, that same page will no longer be listed in the main body of Google’s search results.
Prior to this update, it was possible to rank both #1 organically and in a featured snippet, too.
Whereas previously the search results would show a featured snippet followed by 10 organic results, it now shows a featured snippet followed by nine organic results.