I’m not sure who thought to not put a power button on the hisense roku tv but they don’t deserve their job especially since it’s over a 5 day wait just to get a new remote when the issue could’ve been solved just by adding a power button on the tv
Have you tried just under the brand name on the tv, on the underside about an inch in for buttons?
The power button is on the underside near the left foot on all Roku TVs. It is not just a power button you can get into the into the entire menu system with your finger in a pinch.