Two scrivenings panes at once?

How can I have two scrivening panes at once? I need to edit 2 batches of documents at once by copying one to the other.

View -> Editor Layout to split the Editor either vertically or horizontally.

Once you’ve done that, you can set up whatever view you want in either pane: Outline, Corkboard, Scrivenings, whatever. They’re independent of each other.

The one thing to watch out for is the Navigate -> Binder Selection Affects setting, so that you don’t accidentally change pane A when you meant to change pane B.