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Cancel that; I just figured it out (but you could make it clearer?). Did anyone else fail to realise it's the chevrons that do so?

[Thank you for answering, but that is not a "button", or at least nothing happens on this system, when I try to click upon it. It does not take me to the next set, which is the gist of my request; on long threads, having to scroll through and look for those “buttons” visually can be a real ordeal. This is especially true now that some people have started adding avatars that are a similar shade of orange. It might help if you ask them to desist, but the best solution remains a bit of software that takes us to the next set when requested. Surely there’s nothing difficult about that?]