If you turned on audio alerts (Smoke/CO Alarm or All Other Audio) in Arlo Smart Notifications, you can’t turn off the Detects Audio setting when creating a mode for your Arlo device.
The Detects Audio setting must be on when any audio alerts are turned on to ensure that your Arlo camera wakes up when there is a sound, such as an active alarm.
To turn off the Detects Audio setting:
For more information, visit Why can’t I turn off Push Notifications?.