Windows Latest reports that some people who downloaded Windows 10’s July 2021 preview (KB5004296) and the August 2021 update (KB5005033) are finding their ability to use the helpful Alt-Tab feature has disappeared.
https://www.techspot.com/news/90839-latest-windows-10-update-breaking-alt-tab-tool.html?utm_source=dlvr.it&utm_medium=blogger
https://www.techspot.com/news/90839-latest-windows-10-update-breaking-alt-tab-tool.html?utm_source=dlvr.it&utm_medium=blogger