Adobe has a good tech article on scrolling in Premier Pro. This is functionality that seems strange to me, so I thought I would post it.
I am sure anyone who has tried premiere pro sees that scrolling with a mouse in Premiere Pro moves you down the timeline and doesn’t reveal tracks, but you can still scroll by hovering over the scroll bars and using the wheel, and it can also zoom the timeline if you hold down the option key (though I would like to see a setting to change the scrolling behavior from right to left to up and down).