You can get two PDF/Handwritten documents up at the same time. This new feature is very useful to split the screen in two panels, for example, one side with an informative PDF text book while taking notes on a different document on the other side.
If you want to use the Split mode then open two or more PDFs or Pencil Notes then tap the "..." button and choose the "Split View" option. (See attached screenshot 1)
You can extract clips, highlight and text excerpts from the top side with the new lasso tool and move them to the document at the bottom side using easy drag and drop gestures.
You can also resize the two views in any moment to adapt it to your needs and compare two documents at the same time (See attached screenshot 2).