If you print a notebook from GoodNotes, by default the print out will have the exact same background as the notebook page. If you are using a ruled essential paper template, the print out will also have lines and a beige background.
If you don't want to print the background, but only your annotations and the lines, please change the "Background" in the printing options to "Blank".
If you don't want to print the lines and the background, please choose "Remove Background" in the printing options.