Moving comments to right of screen instead of bottom of screen.

I am using Adobe Acrobat 9.  I recently had to updgrade from Microsoft 7 to Microsoft 10.  I am using Acrobat to write and edit a textbook.  I like to have the comments from coauthors and editors on the right of the screen.  There are three possibilities including comments , texts, and something else.  Now the comments are on the bottom of the screen.  How can I move them to the right?