Per my 2007 manual::::::::::::::::::::::::::
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Air intake selector
To prevent fogging up of the windshield, the air intake mode may change automatically to FRESH depending on the condition of the air conditioning system.
If the ambient temperature drops, the air intake mode will automatically change from RECIRCULATE to FRESH after a few minutes. This automatic change control mode can be canceled bu pushing and holding the button for longer than 2 seconds.
The automatic change control mode will be reactivated if the ignition switch is sett at Acc or off.
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Don't know about the later manuals but the car hasn't changed!