Under TV Options, page 14 of the manual, it enables you to “Zoom” whilst watching live TV but having elected to do so, I cannot see any difference in picture or wording size. I have tried pressing various items on the remote but nothing happens ?
If you zoom a 16:9 image on a 16:9 screen there are no black bars so nothing to zoom. It’s for people who like to zoom in to eliminate the black bars. This reduces the picture resolution and loses image content at the edges.