If you can't see the edges of the videos on your TV when using the SCO Members app, this is due to Overscan on your TV and should be adjustable via your TV Menu.
To assist, on your Apple TV go to Settings - Audio & Video - Video - Calibrate - Zoom & Overscan and display the image shown.
Adjust your TV's zoom or overscan settings to adjust the image so that you can see the "Full Screen" Area.
There is nothing to adjust on the Apple TV, you have to use your TV's settings.
I don't understand- first you say go settings on Apple TV then you say there is nothing to adjust on Apple TV
If you go into Apple TV - Settings - Audio & Video - Video - Calibrate - Zoom & Overscan, this will display a reference image on your TV indicating the edges of the viewable display. If these are cropped by your TV, you can usually use the overscan controls on your TV to adjust your TV to get the optimum picture.
Hope that clarifies!
I found a solution on the Apple TV itself! Go to settings and then go to Video and Audio. Then under resolution click on it and then choose “other resolutions” and I just played around with those until I found one that worked, in my case 1280x960. That solved all my AirPlay problems, even those related to Air Playing from my computer from Safari. Try it out!