Hi, I was watching that topic in the groups section are too ugly, I want to be the topic of groups like the topics of the forum, as I can do to accomplish this?
Looks like the style developer overlooked this area. You can try bringing it up with the developer, or tinker with the CSS classes in the style templates for Groups.
postbit_legacy isn't used in Social Groups. It's all in Group Templates. Use the _suffix of each template to find the one's you need. For instance, it's a good chance socialgroups_message controls the look of messages on Group pages.