The block list is per user. No user, no blocklist.

You could just use "all" in your sorting while logged in, and your blocklist will still work.

Yeah, there's no way to access your block list if you aren't logged in. That's a lemmy level thing.

Filters are not lemmy side, but (iirc) boost keeps a per account filter list rather than an app wide one, since it supports multiple accounts, and people want discrete filters more than universal ones usually. I may be misremembering, since I don't use boost often, but that's what I recall.

By the way, while logged in, you can switch the user to a guest on the same instance. That way, you can easily switch between a logged-in and logged-out view. I don't know what it would do to your filters. I guess it won't help you, but might be usefull anyway.