When using two monitors on a Windows PC, should you convert a Writer document to PDF, open the file and drag it from monitor #1 to monitor #2 then switch to full screen mode, closing the file then reopening it will display the file back on monitor #1, what Adobe Reader doesn't do. This is unpleasant (but not important). Thank you.
What program are you using to "open the file and drag it..."? Have you round trip imported the PDF back into LibreOffice Draw?