When you click that logo, and it brings up that menu, there is a little “house” icon that brings you home :)

The thing is, this is a third party app. The platform we’re on is the Fediverse, it’s just third party apps. No, they don’t provide the same thread-like experience that you get on kbin, but for now, there’s not much a difference in simply browsing kbin instances from Mastodon apps or the similar. This isn’t currently great for kbin.social with all the troubles federating, but explore your options!