Windows 10's app tabs might not arrive in the next big OS update
 

We hope you weren't clamoring for a chance to try Windows 10's Sets in the near future. Microsoft has removed the app tab feature from Windows 10 Insider Preview builds to "continue making it great," including a better visual style and tighter Office...

https://www.engadget.com/2018/06/27/...s-10-app-tabs/