I have a simple single-window application. It displays zero or more groups of controls in that main window based on "configurations" managed in a Settings (Preferences) view.

The "configuration" for a group is a structure (conforming to Identifiable, Codable) with an id, a string to hold a label for the group, and a handful of booleans that if true will show a particular control and not show it if false. An array of this structure is @Published in a class conforming to ObservableObject, and instances of the class are stored in UserDefaults. (It's code taken from one of Paul's examples.)

In the @main App structure, I declare a @StateObject var configs = Configs(). In the body of this App my Scene has a Window for the usual ContentView and a Settings for my PreferencesView. All standard so far. Also standard: in both the PreferencesView and the ContentView I declare an @ObservedObject var configs : Configs.

In the body of ContentView I check to see if the array that's in configs is empty. (At first program launch it is.) If empty, a Text is shown saying "please configure at least one thing." Otherwise, a ForEach() block iterates on the array and instantiates one or more ChannelViews. A ChannelView shows the controls enabled for the channel. A different Settings structure type holds the values for each control.

The PreferencesView has code to create, add and modify the configs.

Here's the weird part. As I modify the configs object (adding to or changing the contents of the array it contains), I expect that the ContentView window should update and show newly-added Channels or disppear Channels that were deleted in the Preferences. That does not happen. However, if I close the application and re-start it, the main window shows the Channels that were configured previously.

I don't understand this behavior. So the question: how do I force the view in ContentView to immediately update/refresh/reload/whatever when the configs object updates?