Choose how each module reaches you

Set each module to Instant, Digest or Muted, and fix an inbox that looks wrong.

In short

Each module can reach you in one of three ways: Instant, Digest or Muted. Pick a quieter setting for a busy module and keep Instant for the ones that need you. Your choice is saved at once and applies on every device you sign in on.

Before you start

Who: anyone signed in, for their own settings.
Plan: none.
First: nothing. The choice is saved the moment you pick it and applies on every device you sign in on.

Steps

On the Inbox page, open the … menu and choose "Notification settings". You can also go to Settings > Notifications.
Under "Notifications by product", find the product.
Choose "Instant", "Digest" or "Muted".

Result: the choice is saved the moment you pick it, and the bell counts again.

Good to know

Muting hides notifications; it does not delete them. Set the module back to Instant and they are listed again.
In Chat, each conversation's own setting - All messages, Mentions only or Muted - narrows this further.
The same page has the emails: Weekly summary, Chat digest, Morning inbox summary, Plan limit emails, Getting-started tips, A note when you have been away and Monitor alerts. Every one of these emails also has a link to stop it in one click.
"Phone and desktop notifications" shows monitor failures, mentions and Planner reminders on a device, for modules set to Instant. Each device is turned on by itself.

If something goes wrong