Border color and fill color grayed out in the form field properties

When trying to modify the appearance of a form field, border color and fill color are grayed out. I go to Field properties accessed by double clicking the field, then go to the second tab "appearance" and I cannot change those two properties. I can get the default color by checking "Highling existing field under the fields menu while I'm in Prepare Form mode. The form is not locked. I am running Adobe Acrobat build: 18.9.2044.251705 on a MacBookPro OS Sonoma 14.5. Adobe cloud says I'm up to date with the software. It seems in the past there was some issue with this but some people said it was fixed. I can stumble along with a work around but would very much like access to the border color and line color (and adjust the line thickness). Any suggestions appreciated. Thank you!