In Acrobat 9 the comment pane showed up at bottom of the page and it spread across the whole width of the page and could be as high as you wanted it to be. This made reading my comments easy.
But in Acrobat X the comment pane can not expand its width, this is not very useful and it is hard to search notes by scanning them.
How to expand the comment pane? I would prefer to change its location as well.