[svachalek]

Wasn't me but I think the principle is straightforward. When you get an answer that wasn't what you want and you might respond, "no, I want the answer to be shorter and in German", instead start a new chat, copy-paste the original prompt, and add "Please respond in German and limit the answer to half a page." (or just edit the prompt if your UI allows it)

Depending on how much you know about LLMs, this might seem wasteful but it is in fact more efficient and will save you money if you pay by the token.

[vl]

In most tools there is no need to cut-n-paste, just click small edit icon next to the prompt, edit and resubmit. Boom, old answer is discarded, new answer is generated.

[mstkllah]

That's what I have been doing. The poster made it sound like they had some magical way of prompting very precisely.