After your question I tried the F3 F301 in Imola. Looking at the blue bar it's really so that if you turn left the bar immediately grows blue and when you turn right it needs a little bit to start with the blue bar. I checked it in VR: I looked at the tires and the wheel. If you look at the these I could see that the tires and the cockpit-wheel are turning with the slightest movement of my Fanatec-wheel even when there is no blue indicator to the right in the HUD. So I think that the blue bar in the HUD has some rounding and you can't see the first small values as a bar when changing from left to right.