You can remove notifications in the “General Settings” of Call Control app. In the “Notifications” section find and disable the notification you would like to remove.

Blocked Calls Notifications – show (or hide) notifications about blocked calls in the status bar.

Missed Сalls Notifications – a setting to show or hide missed calls in the status bar.

Important Notifications – disable or enable general application updates.

You can disable all notifications by navigating to your phone Settings, tap Apps & Notifications, find and tap Call Control. Then click on App Notifications and there will be shown the categories which you can un-check in order to disable Call Control notifications.

* The procedure above is for the Pixel 3 and may vary slightly depending on your phone and Android operating system version. Please note, that Call Control may work incorrectly if you disable the notifications from the app in your phone settings.