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To modify the background color of the navigation bar when using the inline navigationBarTitleDisplayMode, you can use the background() modifier on the navigationBarColor view modifier. Here's an example:

struct ContentView: View {
    var body: some View {
        NavigationView {
            Text("Hello, world!")
                .navigationBarTitle("Home", displayMode: .inline)
                .navigationBarColor(UIColor.red) // Sets the background color of the navigation bar to red
        }
    }
}

extension View {
    func navigationBarColor(_ backgroundColor: UIColor?) -> some View {
        self.modifier(NavigationBarColor(backgroundColor: backgroundColor))
    }
}

struct NavigationBarColor: ViewModifier {
    var backgroundColor: UIColor?

    init(backgroundColor: UIColor?) {
        self.backgroundColor = backgroundColor
        let coloredAppearance = UINavigationBarAppearance()
        coloredAppearance.configureWithOpaqueBackground()
        coloredAppearance.backgroundColor = backgroundColor
        UINavigationBar.appearance().standardAppearance = coloredAppearance
        UINavigationBar.appearance().scrollEdgeAppearance = coloredAppearance
    }

    func body(content: Content) -> some View {
        content
    }
}

In this example, we've created a custom navigationBarColor view modifier that sets the background color of the navigation bar to the specified color. We've also used UINavigationBarAppearance to configure the appearance of the navigation bar and set it to the standard and scroll edge appearances for consistency. Finally, we've applied the navigationBarColor modifier to the Text view in our NavigationView.