OneSignal does not meddle with the how Notifications work, and does not run as a service on Android. It allows to send notifications from the OneSignal server to registered devices, which can then handle it.
Notifications are consumed when you click it (which opens your app). Or you can clear them from the Notification list of the device.
To control your notifications and how the app consumes them, you can use OneSignal Plugin settings like:
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