https://www.bleepingcomputer.com/news/microsoft/windows-10-insider-preview-build-18356-released-along-with-phone-screen-feature/

Microsoft has released Windows 10 Insider Preview Build 18356 (19H1) to Insiders in the Fast ring. This release is mostly bug fixes, including numerous Night Light bug fixes and a fix for KERNEL_SECURITY_VIOLATION GSODs.

Along with this release, Microsoft is also introducing the Your Phone app feature called Phone Screen, which allows you to mirror your Android screen on a Windows 10 PC.