Form Field not allowing me to edit

I'm running Acrobat 2020.

I have a fill-in form with a bunch of fields.

I created a read only field that is visible only (will not print.)

I put text in the field that says "Sign here after printing out the form."

Now when I want to move or edit the field, I go into Prepare Form and click on the field.  The borders turn blue, but there aren't any little square boxes to allow me to select, resize or change any of the properties.  When I do click on Properties, the window opens but everything is "greyed" out and I can't make any changes.  I can't even delete the field.  I've never seen this happen before.