Portal is Board3. Quote by Board3 developer:
So how I can find out and edit it?This is a typical problem for small prosilver based Styles. Sadly theres nothing you can do to fix this. We use the forumlist_body from the Board to get this list. And in prosilver based Styles with a small fixed width theres not enough space, so the list will crushed...
So the only thing you can do, is to set a higher width if your style support it.