The center vent can be turned off completely by using the air-flow select controls to redirect air flow to the lower or upper channels? The door-side vents can be closed completely; to my thinking, it would likely not be an optimal back-pressure scenario to have all middle vents closed at the same time the air flow is directed entirely to that channel.
It's weird that even though the interiors are almost identical in their product line, some have the centre vents that can be closed, and some don't.
My 2017 6 vents can be closed, but the equivalent CX-5's cannot.
Why aren't they all the same I wonder.