If the system settings aren't enough, several "Notification Blocker" apps can force-hide even the most stubborn system alerts. Control notifications on Android - Google Help
For years, the solution was simple: long-press the notification and turn it off. But Android’s recent security updates (Android 12, 13, 14, and 15) have locked down this feature. Apps that run essential background services are now forced to show a notification.
Persistent notifications are a trade-off: