Windows 10 build 18947 (rs xbox)

Windows 10 build 18947 (rs xbox) is a private 20H1 build of Windows 10 which was not intended to be released but accidentally flighted to all insiders in all three rings on 2019-07-24. It's currently the second leaked build of the rs_xbox branch.

Breaking the known insider releases routine, Microsoft managed to also release 18947.rs_prerelease as well as build 18946.rs_xbox_dev before pulling all three releases after publishing the AMD64 variant of this build within ~5 minutes.

They also broke the UX routine and showed up some new major changes.

New features
Both features can be enabled using mach2.
 * Fully redesigned Start menu. It is likely intended to be used in the new Windows 10X operating system. Currently it works properly only with Light theme.
 * New Control Center and Notification Center design. Now it's more compact and convenient. By default it only shows buttons, but it expands as you receive notifications. Control Center is broken in this build, unlike 18946.rs_xbox_dev.