Vertical scrolling

OK. I think I'm going crazy here but I went to grab my phone and hit the app drawer button and noticed that it was now showing up vertically with most used apps on the top instead of the normal horizontal. Was there a way to always change this that I never saw before. I didnt do anything different unless something got presses and changed while it was in my pocket.

I'm just looking for the option to go back and forth if there is one.

Thanks!