https://www.bleepingcomputer.com/news/microsoft/windows-10-kb5015878-update-released-with-gaming-fixes/

Microsoft has released the optional KB5015878 Preview cumulative update for Windows 10 20H2, Windows 10 21H1, and Windows 10 21H2.

This update includes numerous bug fixes and enhancements, including gaming and Windows Autopilot fixes and a new Focus Assist feature.