[RLShare]

Edit the styles templates and use a template conditional around the section that displays a forum like

<if condition="$forum['forumid']!=X">
the code to display the forums
</if>

Where X is the forum Id of the forum you want to hide.
Most likely would want to edit the forumhome_forumbit_level1_nopost template somewhere. Not sure exactly what code you need to wrap in the conditional but thats the gist of how you could do it.