You can't without using some user created scripts. [url]http://www.bungie.net/en-us/Groups/Post?id=60381319&groupId=39966[/url] This script allows you to hide certain tags. Seeing as all the "forums" are just tag, you can hide them.
I personally would not because I like to see all topic, that's why I'm always sitting in "All Topics."
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Drinking from the firehose, Master Race.
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Wouldn't have it any other way.