I did find recently that it helps if you put this sentence in the “What would you like ChatGPT to know about you” section:
> I require sources and suggestions for further reading on anything that is not code. If I can't validate it myself, I need to know why I can trust the information.
Adding that to the bottom of the “about you” section seems to help more than adding something similar to the “how would you like ChatGPT to respond”.