The “old” version Onenote for WIndows 10 is discontinued and delisted from the store.
Yhe only available version is the office 365 install version but if you are used to the layout of the W10 app this new layout is awfull.
You are still able to install the older Onenote for Windows 10 app :
Here is the link to old OneNote for Windows 10 app: https://apps.microsoft.com/store/detail/onenote/9WZDNCRFHVJL
You have to switch to the new OneNote before Oct 2025: https://apps.microsoft.com/store/detail/XPFFZHVGQWWLHB
You are also able to deploy the Onenote for WIndows 10 app via Intune.
Add a new store app, search for this id : 9WZDNCRFHVJL and publish.