How to change apps color via ContentView() and @MainView using ZStack inside TabView()?

Question

this is my ContentView()

struct ContentView: View {
    @State private var selectedTab: Tab = .view1
    var body: some View {
        NavigationView{
            ZStack{
                Color(.green)
                    .edgesIgnoringSafeArea(.all)
                
                VStack {
                    TabView(selection: $selectedTab) {
                        View1(selectedTab: $selectedTab)
                            .tabItem{Label("View-1", systemImage: "1.circle")}
                            .tag(Tab.view1)
                        
                        View2(selectedTab: $selectedTab)
                            .tabItem{Label("View-2", systemImage: "2.circle")}
                            .tag(Tab.view2)
                    }
                    
                }
                //.padding()
                //.background(Color.pink.opacity(0.5))
                //.clipShape(RoundedRectangle(cornerRadius: 20)) // Apply rounded corners
            }
        }
    }
        
}

and this is my @main view

import SwiftUI
import UIKit

@main
struct NavigationTestApp: App {
    init(){
        let appearance = UINavigationBarAppearance()
        appearance.configureWithOpaqueBackground()
        appearance.backgroundColor = UIColor.orange
        appearance.titleTextAttributes = [.foregroundColor: UIColor.black]
        appearance.largeTitleTextAttributes = [.foregroundColor: UIColor.black]
        
        
        UINavigationBar.appearance().tintColor = UIColor.orange
        UINavigationBar.appearance().standardAppearance = appearance
        UINavigationBar.appearance().scrollEdgeAppearance = appearance
        UINavigationBar.appearance().compactAppearance = appearance
    }
    var body: some Scene {
        WindowGroup {
            ZStack{
                Color(.green)
                    .edgesIgnoringSafeArea(.all)
                
                ContentView()
                
            }
        }
    }
}

I have tried putting ZStack in both @Main and ContentView(), together and separately but for the love of Xcode, it doesn't seem to be working - my navigation bar is working prim and proper tho