Gefahrene Wars » Choosing sides in a civil war no prompt?

Hi,

I drop into a low conflict zone and see Fed ships shooting at system authority. So I joined in.
Unlike what I have read elsewhere here, I didn't see any kind of prompt to choose a faction. My right hand screen shows my reputation, and system info, but nothing I could see like a prompt. Why didn't I get that? Did I do something wrong?
Surprisingly I don't think I got any bad rep for attacking the locals, as far as I can tell. Maybe because it was an "official" war zone?

Please help.

I didn't find the right solution from the Internet.

References:
https://forums.frontier.co.uk/showthread...l-war-no-prompt
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Thanks