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You mean on the front page of the forums (public) or somewhere in the admin?

If the front page of the forum, just open the front-page.php file in your template folder, and remove from line 11:

<?php if ( $topics || $super_stickies ) : ?>

to line 45:

<?php endif; // $topics or $super_stickies ?>

That will just leave a list of forums on the front page. Is that what you mean?

If you do that, and you have a long list of tags and short list of forums, the footer won’t be pushed all the way to the bottom. But first let’s see if this is what you want to do.