When your smartphone displays the notification "Looking for Android Auto"

The 'Searching for Android Auto' notification provides a notification to set the device for wireless Android Auto also in Mstick Mode to support the hassle of handling BT every time the Mstick Mode ← Wireless Android Auto mode changes. You can easily delete notifications by registering Android Auto notifications in your smartphone's notification settings.

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Smartphone Settings -> Notifications -> App notifications -> Enter Android Auto in the search bar -> Android Auto ‘OFF’

(Based on Android)