You are quietly minding your own business in the session and suddenly you hear "ding". Then "ding", "ding", ding" and you notice it is from the chat messages that are appearing. You are trying to concentrate on what the presenter is saying or attempting to take a quiz or test and the last thing you want to hear is the dinging every time someone posts a chat. No need to worry, you can turn that off in your settings.
Steps to turn off notifications
1. Click on your name or the gear behind your name.
2. Click on Notifications.
3. Uncheck the box for a chat message is received.