Viewport is not showing

Please see image:

As shown for any JS challenge, the right hand column viewport is no longer showing for me. I have tried using different browsers and deleting my browsing history etc. but the problem is still showing. Can someone please advise? I’m guessing I may have pressed a button that hides it or something

The layout is correct – the JS challenges only show two columns and do not show an HTML preview pane.

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Silly me! Sounds like I definitely need to catch up on sleep…