This is a question about the Append tool and other like it that deal with field mapping data fields. I was wondering if there is a check box somewhere that needs checked or un-checked for the visual que within the "Output Fields" to display them in red if there is no match?
In ArcGIS Pro the data field's name would be in "red" if there was not a matching/corresponding data field within the "Input Dataset". Now they are all just gray in appearance.

Any information would be greatly appreciated.