Why you want it to disappear when you receive a message from him. If you want to notice, it have to stay. If not, you can’t know you received something. No ? It’s literally the goal of the notification Matrix (and the feature i love the most). Even if i’m not in the room, i can hear the notification, and when i come back i know what it is and from who, just looking at the Matrix.
Or maybe i don’t understand your question.
