You are using OneNote for Microsoft 365.
To see the version number and build:
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Select the File menu and select Account.
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Under About OneNote, you'll see the version, build, and delivery channel.
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Select About OneNote to see if you're using 32-bit or 64-bit.
You are using OneNote for the web.
To see the build number, select the File menu, and select About.
Tip: You can also open OneNote in the desktop app.
You are using Microsoft OneNote for Mac.
To see the version number:
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Select OneNoteon the top tool bar and select About OneNote.
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The version number is under the title.