How to disable chat overlay in Apple TV "TWiT Network" app

I’m still using the “TWIT Network” app on Apple TV (circa 2017). Over the weekend somehow I enabled the chat overlay which now obscures the bottom quarter of the live stream. You’re supposed to be able to show or hide it by tapping down on the Siri remote. Unfortunately that function now shows the tvOS native audio/information slide down. Does anyone know how to hide the chat overlay?