As was spotted in a build last week, Microsoft has formally announced the Windows App Preview Program, allowing Insiders to sign up for previews of individual Windows 10 applications.
Windows 11 in the Dev Channel fixes Windows Security app issues, and more
windows 11 insider preview
Build 22621.290 & build 22622.290
Microsoft releases two Windows 11 builds to Insiders in the Beta Channel
windows 11 build 22622.290 screenshots