2007 Nissan Bluebird automatic ventilation control

I own a bluebird sylphy 2007. The problem is with the automatic ventilation of the car. It starts taking fresh air automatically because it has the feature. My country is not a kind that allows you to drive while the vents are on fresh air because of the dirt and pollution. I need to put the Air conditioning system in recycle mode permanently so that outside air does not come in the car. I don't know how to switch off this automatic feature of the car that is creating a lot of problem for me. Kindly help.