OneNote automatically synchronizes shared notebooks at regular intervals. But sometimes you may want to sync a shared notebook to make sure your changes get uploaded right away (for example, right before you shut down your laptop before getting on a plane).
On the File tab, click Info, then click View Sync Status.
In the Shared Notebook Synchronization dialog box that opens, click Sync All to sync all of your shared notebooks. Or click Sync Now next to the specific notebook that you want to sync.