I'm not sure what you expect to see, so I'm taking a shot in the dark here.
I set my camera up the same way, so when I press the FN button, all the data that typically shows at the bottom inside the viewfinder disappears and is replaced with a short little vertical line (more like a vertical dash) in the middle at the bottom edge of the viewfinder. Tilting the camera to the right or left makes little dots appear to the left or right of the vertical dash. The more the camera is tilted off horizontal, the more dots appear next to the line. If the camera is perfectly horizontal then no dots should show - only the vertical dash.