How to hide a label in Yandex Maps?

Question

Yandex maps

How to hide the blue label in the photo above?
Here is my code

<script type="text/javascript">
    YMaps.jQuery(function () {
        var map = new YMaps.Map(YMaps.jQuery("#YMapsID")[0]);
        map.setCenter(new YMaps.GeoPoint(37.573438, 55.688507), 15);
        
        var s = new YMaps.Style();
        s.iconStyle = new YMaps.IconStyle();
        s.iconStyle.shadow = new YMaps.IconShadowStyle();
        s.iconStyle.shadow.href = "img/yap.png";
        s.iconStyle.shadow.size = new YMaps.Point(150, 129);
        s.iconStyle.shadow.offset = new YMaps.Point(-150, -129);
        
        var placemark = new YMaps.Placemark(new YMaps.GeoPoint(37.573438, 55.688507), {style: s}, {hideIcon: false});
        placemark.setIconContent(null);
        map.addOverlay(placemark); 
        
    })
</script>

Answer 1

Remove ".shadow"

Answer 2

And I didn't understand