Can't crack channel video layout

Curious World

I've Got It
Hello guys, a while ago my channel landing page used to consist of one video to the left with a large thumbnail, and three to the right in a vertical row. But now all I get is one video on my landing page. Any idea how I can go back to the old layout? I'll use Rob ****'s channel as an example. This is how my channel used to look layout wise, and I want to go back to it. No matter what I do, I can't see how to do it, even when I go into 'edit' there isn't an option to get the vertical row on the left.

I hope this makes sense.
 
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