I have been using Super+M to access the notifications area then Tab followed by Space to cancel/dismiss notifications.
Is there a "quicker" shortcut (i.e. more direct/immediate action)?
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If you want to disable notifications:
You can press Super+V to open the notifications tray/calendar.
Notifications will still be available in the message tray when you display it, by clicking on the clock, or by pressing Super + M, and they will start popping up again when you switch the toggle to ON again.