The Startup property specifies, as pdfDisplayOnStart, the default viewing mode for a PDF file when opened in Adobe Reader.
Examples:
The following code example publishes the active document to PDF and specifies the thumbnail view as the default viewing mode.
Sub Test()
With ActiveDocument.PDFSettings
.Thumbnails = True
.Startup = pdfThumbnails
End With
ActiveDocument.PublishToPDF "C:\MyDocument.pdf"
End Sub