In OneNote 2013, you’ll notice a History tab. There are several great tools to use here that can help you find what you’re looking for and detect changes. You can even recover items that have been removed from the Notebook Recycle Bin.
Three of the most useful buttons on this ribbon are Next Unread, Recent Edits and Find by Author. If you share your notebook with several individuals, it can become confusing as to who has updated what, even with the color differentiators and initials. It’s great to just be able to isolate certain changes by person or time frame.