Only on Marketplace section (about sell/buy stuff and lend something) the positive trust is visible , and the rest (Bitcoin , Altcoin discussion , Local , and etc) the trust is not visible. Because the latter is mostly about discussion so you don't need trust for discussion. CMIIW
But , you can manually check their trust history by clicking on their profile it takes a few of seconds if you're not a lazy person.
Thanks for the kind information.Me also just discovered it