The stuff to the right of the watch face are "tiles" which are basically widgets that can be supplied by apps on the watch. They're a little bit interactive, but not much, you'll notice that if you're looking at the tile and tap the volume icon, the full Media Controller app opens up to do it. When you tap the little bouncing music note, or open the app from the list, those do the same thing, i.e. open the full Media Controller app. It's a bit annoying, but the technical differences between them explain it. You'll notice similar things with other tiles, tapping on them always opens up the full app on the watch, and all the tiles can do is change visually (and open a different part of the app based on where you tapped, or in the case of the media controller, not open anything and just change tracks.)