The pane is enabled when you go into the Track Changes options dialog and
set the "use balloons" dropdown to Never.

When the pane is open, you can toggle between the main text and the comments
with the F6 key.

--
Regards,
Jay Freedman
Microsoft Word MVP FAQ: http://word.mvps.org
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all may benefit.

BorisS wrote:
I like using the keyboard, and minimizing mouse use. Would like to
toggle between text and comments. How can I do that? Is it easier
(if even possible) to do it with the format where comments are on the
right, or where there is a separate pane at bottom. And how do I
enable that pane at bottom (or am I thinking of Adobe Acrobat, which
does that?).

Thx.