Notifications can be overwhelming in a large organization. And I am pleased to see Microsoft's roadmap have an item that is supposed to be rolling out soon, called: Microsoft Teams: Simplified Global Notification Settings (Roadmap ID 65636)
It promises an easier way to manage all your notifications, globally in Teams. There was just a post in the Admin Center, explaining a slight delay in the roll-out of this feature, but you can get a sneak-peak over at the techcommunity.