OneNote 2016 has had a bit of a bumpy ride in the last few years. Microsoft dropped the desktop version of the note-taking app from the Office 2019 suite of apps, in turn recommending the UWP version.
Microsoft has once again shared the changes it made to the Microsoft 365 suite of products over the past month. Many of the changes were mentioned at Ignite, like the new dark mode for OneNote 2016.