We recommend you to save your data regularly, as crashes may happen and deleting the app from your device will delete your data as well.
To retrieve your .nebo notebooks, open the file explorer and enable the option to display hidden files as shown below.
You will then be able to find .nebo files in the following folder:
Note: You can also type '%appdata%' in the files explorer, it should help you find the hidden Nebo folder.
You will find a folder of 32 mixed letters and digits (or named '._noUser' if you have not signed in Nebo) that includes your .nebo files. Please move them to the second folder manually. When you will open Nebo again, your notes will be displayed properly.
Warning: If you uninstall the application, all your notes will be deleted!
For further investigation, please submit a ticket and add your .nebo files to your ticket, if you agree to share your notes. Please also add files from the "Notebook'sName-files" folder as they may help us troubleshoot.