I think they're still showing Umar a fair bit (not as much, they don't even show full context of anything he does or says) but they've basically cut Pratik's scenes drastically. Like you see him in passing shots. Pratik has a lot of fans and the best way to give him less importance is by decreasing screen space.
He also looks a little defeated to me. I remember when Farah came recently, she told him to stop going after KK and that it's boring. I think that may have gotten to his head. Not to mention, every WKV where the housemates just sit as a guest and Salman pretends only TejRan are contestants in the game probably made him realize he's not winning. Press interviews also had most questions aimed at TejRan.