function clearSizeAndPosition($BlockRef) {
		// left and top are set by jQuery.position
		// width and height are set by function 'adaptSizeAndPosition'
		// All of them need to be removed for being prepared to show a full screen blocklayer
		var aProperties = ["left", "top", "width", "height"];

		if ($BlockRef[0]) {
			$BlockRef[0].classList.remove("sapUiBLyWithin");
			aProperties.forEach(function(sProperty) {
				$BlockRef[0].style.removeProperty(sProperty);
			});
		}
	}
Remove the size and position CSS properties from the blocklayer DOM element

@param {jQuery} $BlockRef the block layer jQuery object
@private