This property controls whether the list view displays the collection size (number of items).
The default value is true.
When this property is set to true, Unity displays the collection size as the first item in the list, but does
not make it an actual list item that is part of the list index. If you query for list index 0,
Unity returns the first real list item, and not the collection size.
If showFoldoutHeader is set to true, the collection size field is included in the header instead.
You can use this property to debug a ListView because the property indicates whether the data source is
linked correctly. In production, the collection size rarely displays as a line item in a ListView.
See Also: UnityEditor.UIElements.BindingExtensions.Bind