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Vertical / Horizontal Scrolling on Win 10 Start Screen

One of the things I liked on Windows 8 was scrolling left to right on the Start screen. It seems like a natural thing on a landscape-oriented tablet. Now that I've updated my Surface 3 to Win 10, I've noticed the live tiles tend to go up and down and scrolling likewise is up and down rather than left to right.

However, I just watched a MOBILE TECH REVIEW of Windows 10, where the reviewer showed tiles going in landscape mode again. Am I doing something wrong?
Actually now that I watch it again, she didn't scroll at all....she just said that she assumed when she gets more icons, it will scroll side to side. Here's the vid: