These are called balloons and you can hide them in your document.
Show All Revisions Inline: both insertions and deletions will be shown in the body of the document and comments wil be shown as Tooltips.
Show Only Comments and Formatting in Balloons: both insertions and deletions will be shown in the body of the document and comments and formatting changes will be displayed in balloons.
Please suggest an improvement
(login needed, link opens in new window)
Your views are welcome and will help other readers of this page.