When cleaning, why does the mopping pad not always extend?

1. When DEEBOT is in Mop Only mode or Vac and Mop mode, the mopping pad will normally extend outwards when cleaning along edges or in a straight line to achieve full coverage (it will not extend when zigzagging). 2. The mopping pad plate will retract when it is lifted, including in the following scenarios: quick mapping, DEEBOT navigation, crossing rooms, returning for mop washing/charging, avoiding obstacles, moving onto carpets, suspending/ending task and moving machine;