Rafael Avila de Espindola <rafael.espindola@gmail.com> writes:

> The documentation says that:
>
> --------------------------------------
> By default, various components of email messages, (citations,
> signatures, already-read messages),  are hidden.
> --------------------------------------
>
> Unfortunately that is not what I am experiencing with notmuch 0.23.1.
> Any time I open a thread I see all the messages in it. I can hide each
> one with <RET>, but that is fairly inconvenient.
>

All of the matching messages are open. So one option is to change your
search (e.g. adding tag:unread)