My desktop files have disappeared from finder.

Granny Hacker wrote:

I can reach them by URL but not through the file manager. This started after the update to 15.4. Before, all my desktop folders appeared on the desktop and in the finder. Now, they don't show up in either. I can still access them on iCloud.

Sounds like iCloud Drive Desktop & Documents got turned on

HT204025

Add your Desktop and Documents files to iCloud Drive - Apple ...

Add your Desktop and Documents files to iCloud Drive - Apple Support

You maybe be able to See them here(?)— make changes to Finder Settings, move your mouse to the right side and spin the caret..

or

iCloud drive missing desktop and documents

What happens when you turn off iCloud Drive or sign out of iCloud

Add your Desktop and Documents files to iCloud Drive - Apple Support

Recover deleted files on iCloud.com

Recover deleted files on iCloud.com - Apple Support

How to Restore Your Desktop and Documents After Disabling ...

https://www.howtogeek.com/273629/how-to-restore-your-desktop-and-documents-after-disabling-icloud-sync-in-macos-sierra/

How to find your Documents and Desktop folder contents after disabling ...

https://www.macworld.com/article/3396119/how-to-find-your-documents-and-desktop-folder-contents-after-disabling-icloud-sync.html

Finder>Go>Go to Folder>copy & paste:

~/iCloud Drive (Archive)

iCloud Drive (Archive) - here you should find all your files