Roxio DVDit Pro Configuration dialog is displayed when you press Export button:
Roxio DVDIt Pro Export Configuration
You need to select the font and its size, style, horizontal and vertical alignment.
The font and alignment information is global for the file and cannot be set for individual subtitles.
Export Zero Subtitle - select whether to export the zero subtitle or not.
The Roxio DVDit Pro text script is always Unicode UTF-16.