Not sure I get that exactly, but at the top of each pedal "meter" is a white stripe. When you can see the white stripe, that axis is pressed to its limit. If you press a pedal and the bar doesn't go white at the top, then you probably need to recalibrate your pedals.
Probably should clarify that you need to have the latest test patch downloaded for this to work. If you're just using standard patch U, this feature doesn't happen (no white stripe).