Symptom: Your favorite game and/or games have disappeared from your Home screen and app drawer.
They are not hidden or uninstalled.
You can see them if you search in the app drawer, but can't otherwise see them, or re-add them to the Home screen.
You may notice other apps that have the same problem. They will also be games.
Solution: Gaming Hub has been set to "Show game apps In Gaming Hub Only".
Go to "Gaming Hub", click the three-dot menu, click "Show game apps", reset to "In Gaming Hub and the Home and Apps screens".
Why the f^#k anyone would WANT an app to hide other apps unexpectedly is utterly beyond me.