Select File > Options from the Ribbon. The Options dialog box is displayed.
Select Editor > Review from the navigation tree.
Under Tracked Changes Formatting:
Click Change in box 1 to change how the text is displayed when it is inserted as a suggestion in the Editor window when Track Changes is enabled.
Click Change in box 2 to change how the text is displayed when it is deleted as a suggestion in the Editor window when Track Changes is enabled.
Why Tracked Changes in the Source are Useful
How to Track Suggested Changes
How to Accept or Reject Suggested Target Tracked Changes
How to Display Tracked Changes Details
How to Only Display Segments with Tracked Changes
How to Change When Track Changes is Automatically Turned On or Off