Microsoft reportedly paused development of Windows 10X, its Chrome OS competitor for single-screen and dual-screen devices. Microsoft is now believed to be focusing on the Sun Valley update for Windows 10, which is set to ditch Windows 95-era icons for modern versions, enable support for rounded corners across top-level UI components, and more. Microsoft may also port some new features of 10X to the regular Windows 10 operating system later this year. Microsoft has also been spotted using Chrome OS like static icons for Microsoft Store apps and Progressive Web Apps.
Source: https://www.bleepingcomputer.com/news/microsoft/microsoft-pauses-development-of-windows-10x-its-chrome-os-competitor/