Every Web Application project has a Users tab in its own workspace (separate from your project's builder canvas, and separate from the Data tab, which manages your raw collection records instead of accounts), where you can see and manage the real people who've signed up to your app.
Viewing and removing users
The Users tab lists every registered end-user account, searchable, with the ability to remove an individual account directly, useful for handling abuse or a user's own deletion request without needing database access. There's no "suspend" state, removing an account is the only option, and it doesn't touch that user's own separate data records, only their account.
Sending an announcement
From the same tab, you can broadcast an in-app notification, a title, a message, and an optional link, to every currently registered user at once. It's delivered as an in-app notification (via a Notifications block your app displays), not an email or push notification. A single broadcast is capped at 10,000 recipients, a title up to 200 characters, and a message up to 1,000 characters.
Tip: Broadcasting is one-directional and immediate — there's no scheduling or draft state, so double-check the message before sending it.