From this Community Post it sounds like we’re not able to use the Show More/Show Less for Rich Text fields, is that the case?
I have a client using a Connector for Help Articles, where all the body
content is added to a Rich Text Field called “Body”, and is being shown on a document-standard
card in Answers. The card is automatically shortening the description, but the client wants the option to show the entire body text. Is this feasible with the way the RTF is being used?