Autopilot altitude hold increments

I have mapped adjustment of the autopilot altitude hold settings to my keyboard . I found trying to do it with the mouse was too difficult. It was working OK with easily manageable increments - 100 feet I think but cannot be sure. Now, the increments are 2200 feet which is not all that convenient. Does anyone know how I can get the increments back to something manageable i.e. 100 feet?

Moved to #self-service:instruments