cruiserandmax

We have a 2018 LE model with the base level manual AC system. It will not allow the windshield defog button or windshield defog&feet button to be used without forcing the recirculate to turn off (uses outside air). Our particular climate actually benefits greatly from using the windshield defog vents with recirculate turned ON to keep out smoke and urban smells/fumes. I have never run into a problem in other cars where defogging using heat and recirculate was not able to effectively defog the windshield so I'm not sure why that is not at least an option in this system. Does anyone know of any modification (maybe a software change via OBDII?) that would enable the use of the windshield defog vents AND recirculate at the same time? Thanks for any tips or ideas!