Feature request: Remember last document in side-by-side view per session

Currently, when document side-by-side is selected the new view on the right resets to the first score of the first tab. I suggest that MS by default remember the last scored selected in the additional view in the same session, so that one can quickly show and hide the additional score and not have to reselect the right tab first every time the side-by-side document is triggered. The would allow one to work between two documents without having to have the second displayed all the time. To get around this, I move the second score that I want to be able to hide and show, via a short cut, to the first tab position.