Updated March 25th, 2020.
You’ve probably seen something like this flying in from the top right edge of your screen:
That’s an “alert.” Alerts (and their cousins, the Banners) are handy, but the default settings put far too many onto your screen. You don’t need a notification for every incoming email, do you? (No, you don’t.)
So… adjust the settings.
Apple Menu/System Preferences/Notifications.
Work your way through the apps on the left and configure the “Alert Style,” on the right. (You might start by turning off notifications in Mail.) Each app gets its own settings and there is no way to change them all at once. Sorry about that. However, you CAN disable all notifications, either permanently or temporarily. You do it via “Do Not Disturb” (seen in the picture above, at the top).
There’s more than one way to turn on Do Not Disturb. Here’s the fastest way to turn on Do Not Disturb.
Tell a friend. Use the “Share” buttons