If you have the Console in the MD, all you need to do is press Shirt+D. That will open the MD full size like the TV. Then just pressing D will close it and pressing D again will open it again in full size.
However, ever since Drum Replacer came out, this setting will not stick. IOW, everytime you double click on a midi clip to open it PRV, or double click a clip to open in Loop Editor, or do anything that automatically opens in the MD, it will always open small. ie: Not full size. And you will have to press Shift+D to get CV back full size again.
I and others complained of the change but it was stated that this new behavior is as intended.
I still don't like this behavior, but have adapted to it.