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Problems with navigation in SwiftUI (1.0)

Hi, first i have NavigationView and dont working swipe back, how in UIKit NavigationController, why?
Second, how to correctly create the navigation flow for my situation:
I have AuthView(), SelectedLanguageView() and OnboardingView().
At first start user show SelectedLanguageView(), next OnboardingView() and in the end AuthView()
User dont can with OnboardingView() return on SelectedLanguageView() and with AuthView() return AuthView()
Just NavigationLink dont working without NavigationView, why?
if this is not the first launch, and user not authorized, then show AuthView(), else if user authorize, then show MainView(),
MainView() include tab bar for 4 items, every item have NavigationView

@State private var navBarHidden = true

    func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
                
        let languagSettings = UserLanguageSettings()
        UserDefaults.standard.set(false, forKey: "isNotFirstLaunchApp")
        
        if let windowScene = scene as? UIWindowScene {
            let window = UIWindow(windowScene: windowScene)
            if UserDefaults.standard.bool(forKey: "isNotFirstLaunchApp") == false {
                window.rootViewController = UIHostingController(rootView: OnboardingView(navBarHidden: $navBarHidden).environmentObject(languagSettings))
            } else {
                window.rootViewController = UIHostingController(rootView: AuthorizationView(navBarHidden: $navBarHidden.not, isAddNavView: true).environmentObject(languagSettings))
            }
            self.window = window
            window.makeKeyAndVisible()
        }
    }

condition if the user is authorized has not added yet

var isAddNavView: Bool = false

var body: some View {
        if isAddNavBar {
            return NavigationView {
                ZStack {
                    VStack {
                        Text("")
                    }
                }
            }
        } else {
            return ZStack {
                VStack {
                    Text("")
                }
            }
        }
    }

i have error, if return NavigationBar, if delete NavigationBar and return ZStack, then all right. I think there is a better solution.
ideas?

NavigationLink(destination: SignInView(), isActive: $isShowingSignInView) {
                EmptyView()
            }
Button(action: {
        self.isShowingSignInView.toggle()
    }) {
        Text("isShowingSignInView")
    }

all navigation links in the project i use like this

@xakacuk Do you still have issues with this?