Why is ROKU always blowing up the screen, magnifying only a quarter of the image?

Constantly blowing the screen up to only a quarter of the screen. Anyone understand? I'm receiving through high speed Comcast Cable.

?2020-07-16T18:25:46Z

call Comcast. they will know how your service is set up.

Ender7722020-07-16T18:13:40Z

that is the zoom feature...it can be turned off