YouTube is experimenting with a new feature that aims to improve user notification experiences by muting channels that users do not frequently engage with. This test will affect subscribers who have set notifications to 'All' for channels they seldom watch. By analyzing user engagement, YouTube plans to reduce notification clutter and prevent users from feeling overwhelmed. The initiative is part of YouTube's broader strategy to keep users engaged without overwhelming them, especially amidst growing competition from platforms like TikTok and Netflix.