google
There should be a way to undo the "Don't display notifications from this app for 1 day" button.
I clicked that button by mistake, and now it seems that there's no way to launch the application in question other than waiting 24 hours for the timer to expire.
It's not a great (or user-friendly) solution but you can delete all of the silenced notifications by running
defaults delete com.google.santa SilencedNotifications
One options for us to fix this would be to add a UI if you "launch" Santa (double click the icon in /Applications) that lists the silenced notifications and allows you to clear them. It's not very discoverable though.
Another option would be that instead of silencing the notifications when you check that box we could instead switch those notifications to use the macOS native notification mechanism, so you'd still get notified but it would be less intrusive. Unfortunately this doesn't appear if you have Do-not-Disturb mode enabled and it seems a lot of people enable this and forget it's enabled, so we're back to square one.
