I am trying to set some privileges for apps to access folders using System Preferences->Security & Privacy and choosing Files and Folders.
However clicking on the buttons for an app has no effect and the + and - icons are greyed out. (Just before this clicking on the button for an app would change the button for another app0.
I am on macOS 11.6.1 and have the same issue in Safe Mode and also with a new admin user.
How do I change the permissions for files and folders