¿Sin acción de "marcar como visto"?

[MarcP]

Lo siento, ni siquiera sabía que eso era una cosa. Aquí tienes tu respuesta:

Request: allow "Unseen" as default home page

Dismiss if very hard, this is like asking for Dismiss on the latest tab, there is not trivial way of adding cause a large amount of stuff you have there is not really disimissable.