Go to Tools - VSdocman menu or press VSdocman button on standard toolbar. VSdocman dialog appears, select Options pane. Set Comment Editor - Others page.

This dialog allows you to set some options of comment editor.
Word wrap in source code
If checked, the text from editor will be wrapped in a source code to the specified length.
The following options define how editable areas in WYSIWYG editor will be highlighted. For better readability, you can highlight editable regions with a toolbar button in the editor.
Editable region border color
A color of dotted border around editable region.
Non-editable area background color
A background color of non-editable areas. It should be a darker color not to distract user's attention from editable regions.