As it stands, IntelliCAD does not yet support print preview function for some PC3 based print configurations, for
example for a popular DWG-to-PDF driver.
This is a known shortcoming and we working to make sure this functionality is added for the future releases.
In the meantime, specifically for the case of printing to the PDF, several freely available PDF printer drivers will let
use the preview button and may offer more control over the PDF generation:
CutePDF: https://www.cutepdf.com/products/cutepdf/writer.asp
PDFCreator: https://download.pdfforge.org/download/pdfcreator/PDFCreator-stable
BullZip PDF: https://www.bullzip.com/products/pdf/info.php