The Windows 10 FALL 2018 feature release will not include the new “Windows Sets” tabular interface as shared below:

https://arstechnica.com/gadgets/2018/06/windows-sets-tabs-in-every-window-feature-wont-be-in-the-next-big-update/

Windows Sets is a new Windows interface feature that was first previewed in November 2017 and will make every window into a tabbed window—has been removed from the latest Insider Preview build of Windows 10. Moreover, the Verge is reporting that the feature won’t be coming back in this year’s next major update, due in October.

The promise of Sets is certainly high. Putting tabs in every window is a way of solving certain long-standing requests, such as the demand for tabs in Explorer. But Sets went far beyond this, allowing collections of different applications to be grouped together with tabs to switch them. As such, Sets became a way of managing one’s workspace, allowing you to combine, say, a Word window of a school paper with the online resources that you’re using to write the paper.

The next version of Windows, likely to be version 1809 with the codename “Redstone 5,” is also going to be a special release. Version 1809 is going to be blessed as a long-term support channel (LTSC) release, meaning that instead of 18 months of patches and support, it’ll receive the traditional 10 years of support and security fixes. If it weren’t an LTSC release, one might expect Microsoft to release a first iteration of Sets—for example, a Sets that only worked with modern applications built using the UWP API along with Win32 applications that used standard title bars.

Microsoft says that it’s still working on improving the Sets experience and that the feature isn’t gone for good. But Sets looks like it needs more time in development than is available.