An interior system has a support and movable member mounted to be movable relative to the support for adjusting the height of the movable member, with a locking mechanism configured to allow unidirectional movement of the movable member relative to the support from a lowest adjustment position to a highest adjustment position. The interior system includes a deactivation mechanism for deactivating the locking mechanism and allowing the return of the movable member to the lowest adjustment position. The deactivation mechanism includes a track and a sliding member sliding along the track, with the sliding member and the track interacting to allow the locking mechanism to engage upon movement of the movable member from the lowest adjustment position to the highest adjustment position, and to disengage when the movable member exceeds the highest adjustment position and until it returns to the lowest adjustment position.