How to turn on the Do Not Disturb Mode

If you are giving a presentation and would like to block the notification banners in the top right hand corner, simply follow the steps.

Click the Notification Icon in the top right hand corner to open notification center.

Otherwise you can swipe with two fingers from left to right on your trackpad to enter Notification Center.

Start with the fingers outside of the trackpad

Scroll up in the Notification Center

Turn on Do Not Disturb Mode and exit Notification Center by clicking the icon again or pressing escape (esc)

Now you can present and all Notifications will be blocked