Be aware that it switches sides and retains the proportions of the other side. In other words, if the notes were thin and the plex was big, it's now going to be the opposite but you can just resize it as normal.
At first I thought this was annoying, better to keep the notes/plex the same size when it switches. However Jack Baty noted that it's an easy way to switch from a small area to a large one quickly and then switch back. Since then I've been using it that way and it's pretty nifty.
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