icons on desktop suddenly too big (and background img lost) but temporary | Microsoft Community Hub (opens in new tab)

Windows 10 ! I know what to do when the icons on desktop suddenly are too large on WIndow 10 desktop computer. Just Display Settings, change to what I want, and carry on. Today, laptop Windows 11, suddenly heard descending two tone sound and the desktop background image was lost. A few minutes later, screen resolution went off and showed over-sized desktop icons. I tried a web search for the lost background; but assumed I would find display setting which I could use for putting back the right...