Dear Adobe experts,
var textBox = this.getField("Text Box"); //textBox.value = "TESTING"; textBox.hidden = true;
Any help would be appreciated,
What you're adding is not a field, but a comment (the tool you're using is under the Comment panel, after all). The technical term for a comment is an annotation.
To remove an annotation you can use its destroy method, but first you need to locate it. That is not so simple because annotations don't have easy to use names like form fields have. If you have it selected when you run the code then you can remove it like this: