If you want to keep a synced copy of your notes on a removable drive, you can change your backup location in the desktop app's settings.
Microsoft provides several supported ways to use OneNote portably across different devices: OneNote for the Web : The most universal "portable" version. You can access OneNote online from any web browser without installing software. Mobile Apps : Full-featured apps for Microsoft Onenote Portable
To be direct, there is no official "portable" version of Microsoft OneNote If you want to keep a synced copy
Microsoft OneNote Portable is a powerful and convenient note-taking application that offers a wide range of features and tools. While it may have some limitations compared to the desktop version of OneNote, it is a great option for users who need to access their notes on multiple computers or devices. Overall, OneNote Portable is a solid choice for anyone looking for a portable note-taking solution. Mobile Apps : Full-featured apps for To be
This is less portable, not more. It is tied to the Microsoft Store infrastructure and your Windows user account. It cannot be run from a USB drive.