A notification is a message that Android or iOS displays outside your application's UI. Notifications include reminders, communication from other people, or other timely information from your application. You can tap the notification to open your application or take an action directly from the notification.
You receive notifications even if you exit the application. If you do not want to receive notifications after business hours, you must log out from the application or turn on the Send All Calls feature or a similar feature. You can then log in to the application or turn off the Send All Calls feature when you return to office.