Мy content disappears in order for a Google ad to appear on startup using Xamarin.iOS

Question

I have the following problem. When I start the application, my content does not appear, and only the banner of Google Ad Mob appears. Only the GPS permission message appears but not the content itself.

The code I use :

public MainPage()
    {
        InitializeComponent();

        _restServiceForecast = new RestServiceForecast();

        _ = DisplayHourlyForecastStartUp();

        _ = ButtonClickedGPS();

        co2lbl.Text = "CO2";
        nolbl.Text = "NO";
        no2lbl.Text = "NO2";
        o3lbl.Text = "O3";
        so2lbl.Text = "SO2";
        pm2_5lbl.Text = "PM2_5";
        pm10lbl.Text = "PM10";
        nh3lbl.Text = "NH3";

        frameFinePowders.IsVisible = false;

        AdmobControl admobControl = new AdmobControl()
        {
            AdUnitId = AppConstants.BannerId
        };
        Label adLabel = new Label() { Text = "Ads will be displayed here!" };

        Content = new StackLayout()
        {
            Children = { adLabel, admobControl }
        };

        this.Title = "Admob Page";
    }

How do I make the banner appear under a certain frame that I want?