It's practically impossible to showcase Snapchat live on a big TV monitor.
This is because Snapchat does not rotate its view (neither do tvs).
Even rotating TVs like SERO do not work with live Snapchat app, only Snapchat photos and videos viewed through the Photo button. Live apps are constrained to Youtube and Netflix, like anyone would want to suddenly see a movie in portrait mode is beyond me.
Please enable Snapchat to rotate its orientation. I know Lens Studio you can view horizontal, but that's not Snapchat live. You want to be able to show people your filters on a big screen, a TV rotated on it's side and mounted on a wall for example. Really important for artists showing in exhibitions or giving presentations. It would make life so much easier.