Lost Desktop and also Safari downloads

My installation of Safari has lost its Downloads button (I can still download without any problems from Brave browser - but I have to choose a folder other than Desktop or Downloads).

I then discovered that my Desktop has also gone missing. Clicking on the link in the sidebar generates this message " The operation can’t be completed because the original item for “Desktop” can’t be found."

When I tried going via the Home > Users folder, I see that Desktop, Documents and Downloads are greyed out and have what looks like a padlock on them.

I have tried repairing with Disk Utility. I have also tried reinstalling Sonoma.

I am running a t 14" MacBook M1 Pro and Sonoma 14.6.1.

Any ideas or suggestions would be very much appreciated!

Warwick