I searched around the net for an answer to this one.
I wanted to rewrite a chapter while looking at it, but without changing it.
What? Speak English man.
Basically I wanted to follow along on my old chapter while rewriting the new one.

If you ever tried to rewrite as you go you know that keeping track of your thoughts gets logarithmically more difficult after the first three sentences are rewritten.
This way I could go split screen and keep the old chapter in front of me (without printing out a copy).
Just hit the Split Screen graphic in the upper right of the active window n’est-ce pas?
Sort of. You end up with two screens of the current chapter. The moment you change something in the right window it shows up on the left window.
That’s when I took to the net. But the answers were wordier than this is getting to be.
The solution is simple.
Duplicate your chapter and rename it by adding OLD to the name.
Just right-click on the chapter, Duplicate, and presto, same chapter. But to Scrivener it is different.
Go back to your split screen. The active window has the chapter name underlined. Click on the title bar of your left window, go down your left hand chapter list and click a chapter. You’ll see the ACTIVE window change to the new chapter, while the other one remains on the other chapter.
That’s it. Click the title bar of the window, go over and click your chapter, click the OTHER window title bar, click the OTHER chapter.
‘Chapter’ and ‘Chapter OLD’ are now next to each other. 😀
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