Answer: 

If you own any of the older models of Walkstool (45 cm or 55 cm) or Walkstool Basic, then it's nothing to do but to avoid having Walkstool attached to your body with lower legs down. If you own the Walkstool Comfort model with bigger rubber feet, do as follows: lock the lower legs when not using Walkstool by twisting the upper legs, locking the lower legs by the rubber feet being close together. The newer Walkstool Comfort models have also a practical pouch for storage and carriage.