[avals]

How i can remove/hide the titel only on the first/main forum page

https://i.imgur.com/EBZCr6N.jpg

[mithrandir]

You would have to use a conditional statement comparing against, if it is the forum archive. Depending on your theme and how bbPress has been implemented, the location of the title may vary. I am by no means an expert, but I can try my best to help out if you could provide more information.

<h1 class="entry-title main-title">
    <?php
    // Display title on all pages except forum archive
    if (!bbp_is_forum_archive()) {
        the_title();
    }
    ?>
</h1>

[TheDream18]

.forum .entry-title {display: none}