Hamburger Menu in xamarin forms

I am trying to make the hamburger menu always visible in the navigation, by deactivating the back button, but the menu icon is not displayed. I have the icon on the master page.

   private static async Task Navigate<T>(T page) where T : Page
    {
       NavigationPage.SetHasBackButton(page, false);
       await App.Navigator.PushAsync(page);
    }

• I have already verified that the icon exists.
• I have placed the icon in different pages (Master, Detail, Home)

And I can not make the icon of the hamburger menu always visible