This is something you can turn on/off in Acrobat ... View ... Tools ... Forms ... More Form Options ... Highlight Existing Fields
Or do you have some code updating the app.runtimeHighlight property.
Thanks Bruce. That is what I used to do with ES3. I’m now in ES4. I went to View/Tools and did not find More Form Options, but I did find this. It is in View/Tools/Prepare Form/Open. Thanks much.