No, no, that's just me mashing 2 screens together to show you have to scroll. I just didn't think to stick a bright red border between the two. It was a quick and dirty edit.
Zoom is a toggle. The FOV is the amount of zoom. Instead of hitting "zoom in" or "zoom out" when the zoom toggle is engaged, you can map that to a slider. Thus, you can toggle zoom with a button, but once zoomed you can zoom in and out at your will by manipulating a slider directly.