https://wccftech.com/windows-10x-icons-rolling-out-to-the-regular-windows-10/

Microsoft is currently working on Windows 10X, its operating system exclusively designed for dual screen devices. While Windows 10X is "an expression of Windows 10," it does seem to be getting quite a noticeable design overhaul. Along with Dynamic Wallpapers and a new setup experience, Windows 10X is also getting colorful new icons in a Fluent Design push.

It now appears that the Windows maker is rolling out these new icons to Windows 10 Insiders running the regular Windows 10. There are already hints that the company would eventually use Windows 10X to modernize Windows 10, as well. The new icons sure get the job done, going away from the flat icon design that Windows 10 currently carries.