In the notification screen you have the ability to select "Mark all as read". Now the difference between read and non read notification is almost not visible. the light blue for non read notification is just slightly different then the white use for read notification.
It would come in handy if you could clear the notification hub of messages. Just make a button that empties out the whole hub for the agent. this way you can get rid of all read notifications.
We don't have this on our roadmap at the moment, but we've made a note of your request, and we'll pick it up at the next available opportunity.
I posted this future request 4 months ago! and now you have the nerve to give this short nothing saying answer.
really unbelievable how slow you guys are with picking up improvements of freshservice.