Toggling a Diagnostic Mode button in SwiftUI using Settings.bundle

SettingsSection

struct SettingsSection: View {
    @State var isShowingCloudLink = false

    var body: some View {
        Section {
            if isShowingCloudLink {
                NavigationLink(destination: CloudSettingsView()) {
                    Label(…)
                }
            }
        }
        .onReceive(
            NotificationCenter.default
                .publisher(for: UserDefaults.didChangeNotification)
                .receive(on: RunLoop.main)
        ) { _ in
            isShowingCloudLink = UserDefaults.standard.bool(forKey: "diagnostic_mode_enabled")
        }
    }
}

Read more here: https://sowenjub.me/writes/how-to-add-a-diagnostic-mode-using-settings-bundle-and-swiftui/