Thank you for your kind introduction!
You are right, I just didn't know how to use it. 😅
Now I found the log button and I believe the butterfly would also show if I make a suboptimal decision. I will confirm next time I make such a decision.
I installed this MOD, and I can find the options in the settings, but I cannot see the butterfly and I don't know how to check the log.
Is it because I also installed the Chinese translation?