Honda CR-V 2020 Owner's Manual page 194

uuOperating the Switches Around the Steering WheeluDefogger/Heated Door Mirror
Canadian models
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Heated Windshield Button
192
Press the heated windshield button to deice
the windshield at the wiper park area and
along the driver side edge of the windshield
when the power mode is in ON.
The heated windshield will automatically
switch off after 15 minutes.
*
1Heated Windshield Button
This system consumes a lot of power, so turn it off
when the window has been defogged or deiced.
Also, do not use the system for a long period when
the engine is idling. This may weaken the battery,
making it difficult to start the engine.