S Note > Create/Edit note > MORE > Background settings > Select a background > Check 'Apply to all pages' S Note Viewer allows you to view (not edit) S Note files. For every new note default background is always white which can be changed from options in note.
With Note 5, default background for all notes has been removed from S Note. Connect your Galaxy Note with your computer for easy S Note content management on your home computer or laptop. Take your PC experience to a whole new level with the S Note app.