In manual mode, how is cabin altitude controlled?

In manual mode, cabin altitude is controlled by toggling the MAN V/S CTL switch. This switch enables the flight crew to directly control the cabin altitude rate of change (vertical speed) rather than allowing the automated systems to manage it based on pre-set configurations. When the switch is toggled to manual, it emphasizes the crew's active role in managing cabin pressure, which can be critical during specific flight scenarios such as rapid altitude changes or in the event of malfunctioning automatic systems.

The other options relate to different aspects of cabin altitude or pressurization management but do not directly address how cabin altitude is controlled in manual mode. Resetting the landing elevation in the MCDU influences the system's settings but does not directly enable manual control. Rotating the LDG ELEV knob affects the landing elevation reference but is not the mechanism for manually controlling altitude in flight. Cycling the ditching switch pertains to preparing the aircraft for water landing procedures and does not influence cabin altitude control.