You can’t restore a notebook once it's deleted, as the notes are moved to the “Trash,” and the empty notebook is removed permanently from your account. However, you can restore the individual notes from “Trash” by: 1. Opening the note you want to restore from “Trash.” 2. Click the three-dotted icon for “More actions.” 3. Choose “Restore note.” Once the notes are restored, you can create a new notebook to contain them.