Honda CIVIC Sedan 2020 Owner's Manual page 211

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To rapidly defrost the windows
U.S. models with color audio system
Models with Display Audio
Models without SYNC button
Models with Display Audio
Models with SYNC button
1. Press the button.
2. Press the button.
uuClimate Control System
1To rapidly defrost the windows
After defrosting the windows, switch over to fresh air
mode. If you keep the system in recirculation mode,
the windows may fog up from humidity. This
impedes visibility.
Continued
* uUsing Automatic Climate Control
209