The split of a collection's user interface: direction and position, with the defaults applied.
public sealed class PdfCollectionSplit
ISO 32000-2 §12.3.5, Table 158 (PDF 2.0). Without a Split entry the direction follows the view: horizontal for details,
vertical for tile, none for hidden and navigator.
kind:method, kind:property, kind:ctor. Press Esc to clear.