Hope you are doing well and sorry for the trouble. As you want to remove the field highlight color.
Please go to Edit (Windows), Adobe Acrobat (Mac) > Preferences > Forms > Highlight Color > Set the Field Highlight color to 'White' as shown in the screenshot below.
This is a setting of the application, not the file. You can disable it on your machine (as described above), but it might show up when someone else opens the file. It is possible, though, to disable it using a script, that can be embedded into the file (if you have Acrobat). Just keep in mind it will affect all the files the user opens, not just yours...
Comprendo... En ese caso, cual sería ese Script. Muchas gracias por la pronta respuesta.
The code to disable it is:
app.runtimeHighlight = false;