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)?
Super+N to focus the currently displayed notification followed by Esc works for me.
A small hack..
Run the below command in terminal or create a shortcut with the below command.
gdbus call --session --dest org.gnome.Shell --object-path /org/gnome/Shell --method org.gnome.Shell.Eval 'Main.panel.statusArea.dateMenu._messageList._notificationSection._list.remove_all_children()'
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.
escape
do anything?dconf
?enter
orspace
to clear them all at once. Beats clearing them one at a time, at least.