Adjustable partition assembly for separating a cargo compartment and a passenger compartment of a vehicle, preferably a transport vehicle, the assembly comprising: rails configured to be mounted to a floor of the vehicle; a base frame attached to the rails and movable in a forward and a rearward direction of the vehicle on said rails; a seating frame pivotally mounted to the base frame, and having a seat portion and a backrest portion pivotally connected to the seat portion; a separation panel provided on the rearward facing side of the backrest portion and configured to be movable relative to the backrest portion for closing a gap between a top portion of the backrest portion and a roof of the vehicle; a first retaining element, configured to be mounted to the roof of the vehicle, with a receiving slot for receiving a top portion of the separation panel; the assembly having at least a first seating position and a stowed position, wherein: in the first seating position, the seat and backrest portions (5, 6) are positioned for seating a passenger of the vehicle on the respective seating surfaces (51, 63) thereof, the top portion of the separation panel extends in the receiving slot of the first retaining element, and the base frame is positioned at a first location along the rails; and in the stowed position, the seat and backrest portions (5, 6) are pivoted relative to the base frame such that their respective seating surfaces (51, 63) substantially face the forward direction, and the base frame is positioned at a stowing location along the rails, which is at a distance from the first location in the forward direction. rails configured to be mounted to a floor of the vehicle; a base frame attached to the rails and movable in a forward and a rearward direction of the vehicle on said rails; a seating frame pivotally mounted to the base frame, and having a seat portion and a backrest portion pivotally connected to the seat portion; a separation panel provided on the rearward facing side of the backrest portion and configured to be movable relative to the backrest portion for closing a gap between a top portion of the backrest portion and a roof of the vehicle; a first retaining element, configured to be mounted to the roof of the vehicle, with a receiving slot for receiving a top portion of the separation panel; the assembly having at least a first seating position and a stowed position, wherein: in the first seating position, the seat and backrest portions (5, 6) are positioned for seating a passenger of the vehicle on the respective seating surfaces (51, 63) thereof, the top portion of the separation panel extends in the receiving slot of the first retaining element, and the base frame is positioned at a first location along the rails; and in the stowed position, the seat and backrest portions (5, 6) are pivoted relative to the base frame such that their respective seating surfaces (51, 63) substantially face the forward direction, and the base frame is positioned at a stowing location along the rails, which is at a distance from the first location in the forward direction. in the first seating position, the seat and backrest portions (5, 6) are positioned for seating a passenger of the vehicle on the respective seating surfaces (51, 63) thereof, the top portion of the separation panel extends in the receiving slot of the first retaining element, and the base frame is positioned at a first location along the rails; and in the stowed position, the seat and backrest portions (5, 6) are pivoted relative to the base frame such that their respective seating surfaces (51, 63) substantially face the forward direction, and the base frame is positioned at a stowing location along the rails, which is at a distance from the first location in the forward direction.