Something I think most designers here have been facing as well, I always wondered why the Responsive View were always taking up the entire height of the screen, when in reality it's not supposed to. Of course it's very beneficial as you could see a lot more content. But when using it to position elements relative to the actual mobile view, it can be irritating as you have to keep testing until you get it right, because of the full height.
Would it be possible we have a responsive view like how Chrome's Toggle Device Mode? Where the width and height is like an actual device screen?