This property controls whether the list view displays the collection size (number of items).
The default values if 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 will be included in the header instead.
This property is usually used to debug a ListView, because it indicates whether the data source is
linked correctly. In production, the collection size is rarely displayed as a line item in a ListView.
See Also: UnityEditor.UIElements.BindingExtensions.Bind