Each release page will contain a list of addressed issues for both 19 versions. To reflect this change, the release notes for Windows 10, version 1903 and Windows 10, version 1909 will share an update history page. These new features will remain dormant until they are turned on using an enablement package, which is a small, quick-to-install “master switch” that simply activates the Windows 10, version 1909 features. As a result, the new features in Windows 10, version 1909 were included in the recent monthly quality update for Windows 10, version 1903 (released October 8, 2019), but are currently in a dormant state. Windows 10, versions 19 share a common core operating system and an identical set of system files.
What's new for Windows 10, version 1909 and Windows 10, version 1903 release notes
