In SwiftUI, if your view is not updating the navigation title for the third level, there are a few things you can try:

1. Check that the .navigationBarTitle() modifier is being applied to the view in question. It should be applied to the view that is being pushed onto the navigation stack, not the view that is doing the pushing.
2. Verify that you are passing the correct data to the .navigationBarTitle() modifier. Make sure that you are passing the correct property or state that should be displayed as the title.
3. In case you are using NavigationLink to navigate to the next page, you can use the destination parameter of the NavigationLink to set the title of the destination view

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NavigationLink(destination: DetailView(title: "Detail Page")) {
Text("Go to Detail Page")
}


1. If you are using NavigationView inside another NavigationView then you have to set the title for the inner NavigationView as well.

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NavigationView {
NavigationView {
Text("Detail Page")
.navigationBarTitle("Detail Title")
}
.navigationBarTitle("Outer Title")
}


1. Make sure that your view is not being recreated every time it appears on the screen. In some cases, if a view is recreated, the navigation title will not be updated. To fix this, you can use the @State property wrapper or the ObservableObject protocol to keep the state of your view.
2. You can also check your use of environment objects, and make sure that you’re passing the correct environment object to your view, and that it’s being updated correctly.

By following these suggestions, you should be able to update the navigation title for the third level in your SwiftUI app.