UBB.threads PHP Forum Software Community Forums UBB.classic UBB.classic 6 Support How to get rid of subscriptions

Is there a way to remove user thread subscriptions?

I only keep one forum open at a time and all other forums are archives (and closed). So I'd like to remove subscriptions from closed forums so reindex does not take for ever.

How can I removed them?

Running 6.7.3 on linux