Row Rule Color Does Not Fill Field Completely

I used the Wizard to create a Row Rule to change the color of a field to Highlight. But, the highlight color only fills part of the field, rather than the whole field:
image

The field is Read Only, and that may be the problem.
Is there a workaround?

I tried applying the Default style first, but the field then remained as read only and only partially fillable. I can successfully highlight other fields that are not read only, and get the highlight color to totally fill the field.

I have the same question. Did you ever resolve the issue?

No, I never figured out a solution. It still looks exactly like that screenshot in Live for us.

I had submitted CS0002780121 last year, and got the reply from Tech support that highlighting works fine in 2021.1.12 so they couldn’t help me.