I prefer to display hidden characters while creating documents. I have noticed that in 3.4.4 (not in earlier versions) that after saving a PDF file, the display hidden characters tool does not work. I have to use Tools, Options, LibreOffice Writer, Formatting aids, and check options that are now off, but were on right before saving the PDF file. Len Nasman <webmaster@bvres.org>
Thanks, already reported (and fixed) with 'Bug 40482 - CONFIGURATION: Formatting aids - displayed nonprinting characters become unchecked during printing and PDF export'. *** This bug has been marked as a duplicate of bug 40482 ***