How Do I Turn Off Notifications?
Notifications can be generated and blocked in several ways.
Notification settings are reached via the gear icon. Unchecking all the boxes will remove all notifications from Outlook. This is permanent until your check the boxes again.
In Mac OS
There may be times when you temporarily want to suspend all notifications while using your Mac. For example, you will be showing your screen on the classroom display. In the case, you could enable Do Not Disturb in your computer’s notification settings by following these steps.