Yes, that is what i thought, but when i submitted feedback, the samsung tech said i could set that to stay on all the time. I think he is wrong. He didnt explain how to do it either. Smh. Now i dont even see a feedback button here in the member app.
There used to be a setting for that but I haven't seem it in a while, but if you put the call on speaker it should stay on as long as you don't minimize to use other apps. Cos as long as another app is open it will go dark. So just keep the phone app open. And it will also go off if you are using Bluetooth.