To fix this, you must use the system file ... IconCache.db is a unique database file that stores copies of every icon for Windows to access the data whenever it wants to create an icon.

If there has been a recent Windows 10 update, it could be that your missing desktop icons are related to a vulnerability patch contained in that update. A final fix to try to resolve the issue is ...

To fix your cellular data ... the top right of the screen to see the Control Center and look for the Mobile Data icon, which is an antenna to the right of Airplane mode. If it's off, tap it ...

To fix the issue, you need to convert the URL ... empty area and selecting New > String Value. Set the Value data to the desired icon size. The default size is 32. You can experiment with ...