I wouldn't worry....the "SIS and Logo" menu is not active...
It could be because you have such a low "vertical resolution". 240 active lives isn't very much. In case you don't know what those things are, "Screen Inside Screen" (SIS) is just picture in picture (PIP). The logo option would allow you to upload a logo and display it in one of the windows. You could also use "keying" in one of the windows to make the logo appear more professional. For complex setups with more processed inputs, there would be edge blending and multi window applications as well. I don't remember if your machine can genlock a second (unprocessed) input to a window and do picture in picture, but it doesn't matter. For downscaling game content to 240p those features are of little or no value. Obviously, you couldn't pass through very many viable real input signals unprocessed and display them inside a window on a 240p canvas. Your logo would need to be very small and it would be pixelated.
240 vertical lines doesn't provide very much screen real estate to display a second window. Although, having a second window on that machine is pretty useless for gaming, anyway. It can't process a lot of inputs simultaneously. PIP and logo are better for upscaling and there's probably better ways to do those things than a Corio2.