As is swiping notifications away—just swipe ’em sideways if you don’t want them anymore. Or when you want to go back in the browser, just swipe the page away. Or when there’s a paged interface like the Applications Menu, just swipe through.
And of course, if you missed it and want to read more: https://blog.elementary.io/multitouch-gestures-in-elementary-os-6/
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