You always want "full pixel" or "full" or the equivalent on anything with good signal (like from a game console). Anything else (such as normal, 16:9, zoom, etc) typically cuts off a bit around the edges. It's a left over from back in the day when analog TV signals actually had pixels that weren't part of the picture, so you wanted the outer edges cut off so the picture would actually fill the whole screen. With most digital content that's not an issue, and "full" or "full pixel" are the only way to make the TV actually display every pixel that's being sent to it. Most games know that TVs do that by default, so they move the UI and stuff a little bit in from the edges so that stuff doesn't get cut off, but it's possible Japanese games do it less, or that your TV cuts off more than most. If you leave it on full pixel you should notice that you can now see more at the edges of everything, which means you're seeing it how it's supposed to be now.