Which Version of OneNote is opened from the Microsoft 365 (Office) App on a New PC Windows 11?
The Microsoft 365 (Office) app opens Web OneNote (OneNote Online) on a New PC
Windows 11, if you don't have Office pre-installed. Open from the Microsoft 365 (Office) app is Web OneNote (OneNote Online).
When you open the Microsoft 365 (Office) app, in “Welcome to Microsoft 365” page, your OneNote notebooks are listed in the “Recently opened”.
When you click to open your OneNote notebook, the app opens the Edge browser.
Then, you can see a OneNote open your notebook in Edge.
This OneNote is Web OneNote.
Edge Browser Run Web OneNote
Web OneNote is opened by browser, and on the top, most visible markings are the Web Apps toggle icon and the settings icon for the gear.
Install Office 365 Desktop Version
In the upper-right corner of the welcome page of the Microsoft 365 (Office) app, you can download and install Office 365 desktop. (Provided you purchased Microsoft 365)Office 365 desktop includes OneNote desktop.
Install the free desktop version of OneNote
If you don't have Microsoft 365, you can open the Microsoft Store, search for OneNote, and then download and install the free desktop version of OneNote.
The Microsoft 365 (Office) app will open the desktop version of OneNote in the future
After you install Office 365 desktop or OneNote desktop, when you click OneNote Notebook in the Microsoft 365 (Office) app, OneNote desktop will open. It no longer opens Web OneNote.