The Windows desktop file is automatically deleted after the latest Windows update.
After updating to Windows 10 KB4532693 it is reported that the desktop file will be deleted.
The bug was to reset all the shortcuts on the desktop and make the Saved file / Start menu a completely new desktop.
Microsoft says it will create a temporary user profile.
However, if this problem comes to you too, do the following
Settings -> Update and security -> Windows Update -> Update History -> Select Update Microsoft Windows (KB4532693) -> Uninstall update
Uninstall the update in this way