Thank you for your answers. Now I removed LibreOffice STILL and installed LibreOffice FRESH. The problem: As described also here FRESH does not support the ReportBuilder.
There is a bug report in Arch since 2018. Someone describes here a workaround,, that he used successfully; this is the translation from the German page:
Following the hint of the maintainer in my bug report I compiled it myself. This was - despite several attempts - easy, because I could understand what dependencies have to be put back in by means of the diff file.
Unfortunately I do not understand that procedure and for me, this is a real showstopper and I will not be able to use Manjaro without the BASE Reports! I’d appreciate any proposal.
Thank you, Michael