Note 'bubbles' should not obscure the PDF text
Note 'bubbles' posted at the margins, currently obscure the PDF text in documents with ordinary margin sizes. This makes it impossible to read what you're commenting on, at the same time as you write the comment. I'd like to suggest that the note 'bubbles' instead do not cover the text you're commenting on. This would enable you to re-read and recheck what you're commenting on, as you comment on it.