Notebook's Properties in Outline contain some useful information that you might need in order to successfully operate your notes.
First of all you can find out where the notebook is stored. It can be either local folder or a cloud storage. To change notebook's location on Mac, please open the folder that contains your notebook in Finder and copy the folder to any storage of your choice. Please mind that you need to install a third-party cloud client on your Mac first, so that you could place a notebook to its folder.
Note: It is impossible to place a notebook in OneDrive from Mac right now. Please find out more about the ways of syncing your notes with OneNote here
On iOS devices you can change the notebook's location directly from Outline.
Note: Once you share your notebook to MS Clouds on iOS devices, it is no longer available for sharing to other services. To get it out of the cloud storage you need to locate it in Finder. Search for StorageOne in This Mac. Found folder shall contan your notebooks.