When OneNote shows "Not Responding", it usually means the app is stuck during a task (syncing, loading a large notebook, ...

I'm on a desktop, with a keyboard and no touch screen, not a tablet where I switch between touch and pen. And I have some very large OneNote notebooks used to hold reference material. This default is ...

Use the following suggestions if the OneNote notebook is not showing in the app. Sometimes, it can be the corrupt cache in OneNote that causes issues. Clear OneNote cache and see if it works. OneNote ...