Hi,
I too prefer the old layout with the section tabs at the top of the screen. However, a recent Microsoft "upgrade" has discontinued that layout as an option for users. That's the bad news.
The good news is that I've found a way to get around it by reinstalling prior versions of the app.
I've located the versions that I want and saved them to an external drive. That way, I have access to them whenever I want. Since I use OneDrive, all my personal data (my Notes) are saved in the cloud. So on my computers, I simply removed the current
app and installed the old version from my external drive. You can actually download the file from the Microsoft website, just search for release notes. I don't have the version right in front of me, but it should be one of the files prior to like May or
June. Once you've reinstalled, all you have to do is sign in and all the data from OneDrive is now synced to the version with the top tabs.
For my mobile devices, the concept is the same but it's a little bit trickier getting to the previous version. Basically, if you're diligent about keeping your apps updated to the most current version in iTunes, you probably won't be able to find an older
version of the mobile app. If in iTunes, the app icon has a banner that reads "update", it means that the version you have is not the most recent and so there's a chance that it might be old enough to actually be the version with the top tabs. You can right
click on the icon and there's an option there ("Get Info" maybe?) that will show you the path to the mobile app. That's the file you want to save.
After installing the old version of the mobile app (using itunes, not over the air syncing) you must turn off the automatic syncing feature. Otherwise, your device will keep "upgrading" you to the most recent version in the background.
Now that I have to manually install upgrades for my mobile devices and my computers, I simply ignore the ones for OneNote so I can keep using the old version with the section tabs at the top. You should only have to do this once. But if for some reason
you get upgraded, you have the older version saved off so that you can restore them at anytime.
Also realize that by doing the above, you will miss out on any new features Microsoft may add to the product, as well as any security enhancements. For me, it was worth it because having the section tabs at the top was really important to me. Only you
can decide if its worth it to you.
Hope this helps.
By the way, I have all Apple products.