how do i remove "highlight" bar

If I understand correctly, you want to remove the highlight effect when a field is selected?

To remove it, please inject the css below: 

.form-line-active {

    background-color : inherit!important;

}

.form-line.form-line-active {

    background-color : inherit !important;

}

You can inject custom css by following this guide: How to Inject Custom CSS Codes

The field should look like the screenshot below once the css is injected.

If you need further assistance or you were referring to a different issue, please let us know.
Regards.