When you understand how App Check will affect your users and you're ready to proceed, you can enable App Check enforcement.
The following steps describe how to enable enforcement for Data Connect, Vertex AI in Firebase, Realtime Database, Cloud Firestore, Cloud Storage, Authentication, Google Identity for iOS, Maps JavaScript API, and Places API (New). Once you enable enforcement for a product, all unverified requests to that product will be rejected.
Open the App Check section of the Firebase console.
Expand the metrics view of the product for which you want to enable enforcement.
Click Enforce and confirm your choice.
Note that it can take up to 15 minutes after you enable enforcement for it to take effect.