I use OneNote a lot on my Lumia 830 running Windows 10 Mobile.
The only feature I am missing is a way to undo last action, for example a line of text deleted by error etc.
Is there a way to undo in OneNote?
There isn't any action history in OneNote for Windows Phone / Windows 10 Mobile.
If you made some unwanted changes, the only few ways to get back to the last good version I can think of are :