Windows 10 build 18946

Windows 10 build 18946 is an internal build of the Windows 10 May 2020 Update, which was accidentally released to the Insider Fast Ring on 24 July 2019 alongside builds 18947.rs_xbox and 18947.rs_prerelease. This build includes a number of significant changes to the user interface reminiscent of the design changes later found in Windows 10X and Windows 11.

New features

 * A fully redesigned Start menu.
 * A new Control Center design that expands as notifications are received.

Enabling the new features

 * To enable the new Start menu, use the mach2 tool, run an elevated command prompt session and type in.
 * To enable the new Control Center design, open the Registry Editor and navigate to, then create a DWORD value named   with a value of 1.