I have added a custom field called ‘Titel’, above the name and inside the metabox. In the input screen the field is visible and Titles have been entered yet when looking at the resulting guestbook, it still has no Titles.
I have checked with WPproblemsolving tool to switch off theme and other plugins bt that gives no titles either.
Yes that was it Marcel. And I also found the star-ratings and likes and social media there ;-)
Now a follow-up question: The title starts with “Titel:” Is it possible to suppress or hide that? And can I set a heading tag or format the actual title so it stands-out.