An arrangement of seats , in particular intended to be installed in an aircraft cabin , comprising: - at least one "front" seat unit and at least one "rear" seat unit located behind one another along a longitudinal axis (X1) of the aircraft cabin and comprising respectively at least one seat capable of passing from a "seating" position to a "lying" position, - a transverse passage between the "front" seat unit and the "rear" seat unit to allow access to an aisle , the arrangement of seats comprising movable closing means capable of at least partially closing the transverse passage when the closing means are deployed, - the closing means comprising a first wall and a second wall mounted so as to be movable relative to the seat unit , - said first wall being able to slide in a first direction of deployment (D1) between • a "stowed" position, and • an "deployed" position, in which the first wall closes at least part of the transverse passage between the "front" seat unit and the "rear" seat unit , - said second wall being able to slide in a second direction of deployment (D2) between • a "stowed" position, and • an "deployed" position, in which the second wall closes at least part of the transverse passage between the "front" seat unit and the "rear" seat unit , - the first wall and the second wall being located on either side of an intermediate wall , in particular formed by a portion of a fixed shell of the seat unit , characterized in that the intermediate wall has a corrugated shape defining hollows , two successive hollows being open in two opposite directions, rails of one of the walls among the first or the second walls being housed in hollows open towards the seat and rails of the other of the walls among the first and the second walls being housed in hollows open in a direction opposite to the seat . - at least one "front" seat unit and at least one "rear" seat unit located behind one another along a longitudinal axis (X1) of the aircraft cabin and comprising respectively at least one seat capable of passing from a "seating" position to a "lying" position, - a transverse passage between the "front" seat unit and the "rear" seat unit to allow access to an aisle , - the closing means comprising a first wall and a second wall mounted so as to be movable relative to the seat unit , - said first wall being able to slide in a first direction of deployment (D1) between • a "stowed" position, and • an "deployed" position, in which the first wall closes at least part of the transverse passage between the "front" seat unit and the "rear" seat unit , • a "stowed" position, and • an "deployed" position, in which the first wall closes at least part of the transverse passage between the "front" seat unit and the "rear" seat unit , - said second wall being able to slide in a second direction of deployment (D2) between • a "stowed" position, and • an "deployed" position, in which the second wall closes at least part of the transverse passage between the "front" seat unit and the "rear" seat unit , • a "stowed" position, and • an "deployed" position, in which the second wall closes at least part of the transverse passage between the "front" seat unit and the "rear" seat unit , - the first wall and the second wall being located on either side of an intermediate wall , in particular formed by a portion of a fixed shell of the seat unit , <EOS>