Automatic headrests back – deactivable???

An evening together, with my long boat, the rear headrests run up automatically as soon as the seat is loaded. That bothers me immensely when, for example, there is a bag in the back seat and the headrest in every curve drives wildly up and down. Moreover, almost every of my fond passengers puts the headrest down again because it is too high. Can one deactivate this terrible function somehow??? Greetings Matthias p.s. By the way, I find it wonderful that the seat occupancy certificate ng belt straps and airbags are deactivated and the headrest turns up and down, but not a forgotten seat heater is deactivated. Wasn’t thought to end here?