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Is this the form you are working on https://www.jotform.com/61953328845162?
If I understood you correctly you want to unrequire state field if country field is filled.
Currently your state field is not required. First you would need to make your State field to be required.
Then you can set your condition like this.
Here is my demo form: https://form.jotform.com/62244974176968
Feel free to clone it.
More about conditional logic you can find inside of this guide:
Hope this will help. Let us know if you need further assistance.