Preview pane is open in Skype, how can I disable it?

So this is something that's been bothering me for a while.. And I'm aware that Skype forums would probably be a better place for asking, but I like this forum so I thought I'd try here first. Anyway, I'm not stupid when it comes to computers. I know how you normally disable (or at least hide) the preview pane, but the usual button for doing so isn't there. I'll show screenshots below to prove...



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