In your user settings you can define how many note's levels you would like to see.

• Note depth
  defines for how many levels you want to see the title of notes. You should normally put that to a large number like 66 because you want to see all notes.
• Note text threshold
  defines up to which level you want to see the note's text. This should normally be a smaller number (like 6) so that you don't have to scroll too much if two people got into a length 'discussion'.

-- Hofmator