On WWDC 2023 Apple announced this: https://developer.apple.com/videos/play/wwdc2023/10040/?time=648
And as you can see and hear, they are saying: "In the past, entire System Preference panes were hidden to fulfill this requirement. With the introduction of System Settings, we were able to implement a granular management approach. Instead of hiding entire panes, the administrator can restrict modifications of a specific setting which now shows a label about its management state."
But where Apple Developer documentation can I find the payload for this? The only thing I was abble to find is https://developer.apple.com/documentation/devicemanagement/systempreferences which is DEPRECEATED for 13.0 macOS.
Apple didn't introduce a new set of restrictions for System Settings. Instead, existing restrictions were reinterpreted to only restrict the appropriate portions of System Settings, rather than blocking entire panes. Apple also introduced several new restrictions which affect specific parts of System Settings. See the documentation of the Restrictions payload and look for ones that were introduced in macOS 14.
In addition, the mechanism for hiding entire System Preferences panes continues to work in System Settings.