Ok. Found this from FW 2.10 changelog :
- Bypass Assign > Position—Position determines the location in the Exp Pedal or Variax knob’s travel where the block is engaged. For example, if set to 1%, the block will turn off as soon as the pedal is moved to the heel position. If set to 99%, the block will only turn on when the pedal is moved to the toe position. To swap the on/off state regardless of position, click the small bypass icon above the selected block.