First of, this is a duplicate of Rahmen/Boxen (Frames) in Absätze umwandeln/exportieren and I intend to cross-post the solution as soon as possible, in the case there is one.
So I downloaded the ODT-files for LO Basic’s reference cards here: https://wiki.documentfoundation.org/Documentation/Publications#LibreOffice_Basic_Reference_Cards
It appears that the main content is all set in frames in the documents. I rather would like them to be a bit more accessible and formattable by having them as normal text, i.e. typeset in normal paragraphs.
=> Is it possible to convert a frame in a normal text paragraph?