You can swipe (with the trackpad or magic mouse, only works when the cursor is hovering over the notification) or drag the notification to the right to make it go away.
Re:Dear Apple, please fix notifications
by gordon_freeman on Wednesday January 31, 2018 @09:14AM
(#16273934)
I think you don't need to dismiss these notifications as they will go away in few seconds anyways.
Re:Dear Apple, please fix notifications
by bryanculver on Wednesday January 31, 2018 @09:15AM
(#16273939)
Click and drag it to the right.
Anyone know how to quickly dismiss these without taking an action?