https://wccftech.com/microsoft-windows-10-sets-offline/

Microsoft released a fresh new Preview Build to Windows Insiders today from its Redstone 5 branch. While today’s release brings a number of new feature improvements, it is also removing possibly the most hyped feature of the upcoming Windows 10 version.

Windows 10 Sets is Microsoft’s way of adding tabs to the File Explorer. The feature is designed to improve user productivity by bringing everything related to a task at the same place. From relevant webpages and Word documents to other files and applications, the feature takes a lot of working together between the different apps and operating system to bring convenience to the end user. Microsoft managed to bring first party experiences like Calendar, Mail, Microsoft Edge, and One Note together to create a seamless experience.