Question about Mill Gentle Air WiFi oil filled radiator

Here's what the instructions say:
"The "open window" function can be deactivated / activated by pressing and holding the settings button for a minimum of 3 seconds. You can also deactivate/activate the "window open" function from the application if it is configured for WiFi.
The heater will remain in "window open" mode for a maximum of 1 hour. After 1 hour, it will automatically return to normal mode."