You see the width of the PDF, and so you don't see the whole length of the page. Yes, next page button jumps down to the next part of the page that you haven't seen yet, and then when you're at the bottom of the page, it goes to the top of the next page.
The panning you've seen in videos is when you are in vertical/portrait mode. Actually, in both rotations, you can choose to zoom in and pan. And in Vertical mode you have "fit to screen" which usually makes everything too small, and in landscape mode you have "fit to width".
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