I don't think anyone knows or the feature is currently broken. I just looked for 30 minutes and found nothing (partly because the toggle label is indexed with pages, so EVERY kbin post is returned).
BUT
Just of the hell of it, tried Bing and ChatGPT popped up this:
According to a Reddit post1, Kbin is a decentralized platform for content aggregation and microblogging that operates within the Fediverse networkDynamic lists are a feature of Kbin that allows you to create custom lists of posts based on filters2.
akai