Options for Flatten(PdfFlattenOptions): which annotations are flattened, and for which intent.
public sealed class PdfFlattenOptions
ISO 32000-2 §12.5.5 (appearance streams) and §12.5.3 (annotation flags). The defaults flatten the form's widgets only, as a viewer shows them.
kind:method, kind:property, kind:ctor. Press Esc to clear.IncludeAnnotationsGets or sets a value indicating whether every annotation is flattened, not only the widgets of form fields. The default is false.