Test.swift

extension Color {
    static let myAppBgColor = Color.white
}

struct Screen<Content>: View where Content: View {
    let content: () -> Content

    var body: some View {
        ZStack {
            Color.myAppBgColor.edgesIgnoringSafeArea(.all)
            content()
        }
    }
}

struct Root: View {
    var body: some View {
        NavigationStackView(easing: .easeIn(duration: 3)) {
            A()
        }
    }
}

struct A: View {
    var body: some View {
        Screen {
            VStack(spacing: 50) {
                Text("Hello World")
                LazyVGrid(columns: [.init(.flexible())]) {
                    ForEach(0..<20) { i in
                        Text("Won't Transition")
                    }
                }
                PushView(destination: B()) {
                    Text("PUSH")
                }
            }
            .background(Color.green)
        }
    }
}

struct B: View {
    var body: some View {
        Screen {
            PopView {
                Text("POP")
            }
            .background(Color.yellow)
        }
    }
}

struct Test_Previews: PreviewProvider {
    static var previews: some View {
        Root()
    }
}