Sorting by last mail in conversation in Inbox

Hello Everybody!
I don’t know if I’m to stupid to see, but recently emClient sorts the unified Inbox wrong - if a mail is received, it is placed on top (Sorting by Date). BUT: If it is a conversation, it gets sorted by some other metric, which means that I miss the urgent Mails in conversations, or can’t see it immediatly. What am I doing wrong?

Greetings from Munich,
Bela