MYW_VS for Mobile View of MyWebsite for smartphones and tablets
You can easily tell which editor version you are using from the menu bar at the top of the screen.
Menu bar of the editor version ordered before 6 Sept 2017:
Menu bar of the editor version ordered after 6 Sept 2017:
Users of the editor version ordered before 6 Sept 2017 will be notified as soon as an update is possible.