How to clear items in notification list?

How I can clear notification items?

I mean this list:

You cannot clear it completely but you can mark them all as read by clicking on dismiss.


Can you add feature to hide dismissed items?
often it shows notifications like
for already processed items when 0 messages are present in specific group ā€¦

by other hand, Iā€™d like to have dismissed notification that I have 0 messages in group at the top of this list ā€¦