Attached is the macOS provided Print dialog that appears just after clicking the Print button in PM's Print Settings dialog.  I clicked on the PDF popup, chose Save as PDF... and picked a filename.  A PDF file was produced.
If you're not seeing a similar dialog with a PDF button, I'd like to see what you're seeing, please post a screen shot.  Use the 'Attachments and other options' link when you're composing your reply to this message and there you'll be able to upload your JPEG format screenshot.
Thanks,
-Kirk