Leaf that have HEAT button on CC panel:
AUTO engages partial recirculation if heat is needed.
No need to hold recirculation button, it just defaults back
recirculation mode into AUTO (aka third-recirculation if heating engaged).
AUTO almost always keeps airflow setting at defrost+feet in cold (sub-freezing) weather.
Only if there is a lot of sunshine and cabin is fully warmed up, it might switch to feet.PS! Selecting FEET actually keeps defrost vents active with limited airflow.
To save energy (and it's not very damp) you can manually select FEET, glass will not fog up.
To have more air to the feet or defrost while in defrost+feet or feet mode, close left and right face-went.
To save even more manually stuff up rear passenger foot ventilation.
Selecting face+feet will totally block airflow to windscreen, same with face only.
Also full recirculation is possible with defrost only on newer CC panels with HEAT button.
Just select defrost with MODE button and push recirculation. Useless mode, it fogs up.
TIP: if you want to keep Leaf running with heater working and also want to save juice, push
recirculation button when you exit the vehicle (and there is nobody inside). It will not fog up
as there is no moisture buildup. Except if everything inside is wet