What color shades fields on the screen in word?

Word doesn't have a specific term for "color shades" when referring to fields on the screen. However, you might be referring to:

* Field Shading: This refers to the background color of a field, which can be customized in Word. You can access this by right-clicking on a field and choosing "Field Shading."

* Field Highlighting: Word allows you to highlight fields using different colors for better visual clarity. You can enable this by going to "File > Options > Advanced" and checking the "Highlight fields" checkbox.

If you are referring to a specific feature, please provide more context, and I can provide a more accurate answer.