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 <email@example.com>
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 ***