Xamarin iOS: Customized again button picture is just too small

I’ve a customized UINavigationController and the next code in that controller to supply a customized again button picture:

public override void PushViewController(UIViewController viewController, bool animated)
{
     base.PushViewController(viewController, animated);
        
     viewController.NavigationItem.BackButtonDisplayMode = UINavigationItemBackButtonDisplayMode.Minimal;
 }

public override void ViewWillAppear(bool animated)
{
   base.ViewWillAppear(animated);

   SetNeedsStatusBarAppearanceUpdate();
        
   var uiNavigationBarAppearance = new UINavigationBarAppearance();

   // ...
   // configure frequent UINavigationBarAppearance properties
   // ...

   var img = UIImage.FromBundle("again");
   uiNavigationBarAppearance.SetBackIndicatorImage(img, img);

   NavigationBar.StandardAppearance = uiNavigationBarAppearance;
}

This works superb, however I seen the again picture (which is a PDF asset) is just too small in comparison with NavigationItem.RightBarButtonItems. The truth is, if I take advantage of the identical PDF as a RightBarButtonItem, will probably be greater.

Is it attainable to configure the scale of the again button picture so it seems regular?

P.S. Minimal supported OS model is 15.4.