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I checked the same template, according to your screenshot. And I am successfully able to use the template.
I would suggest you, to clear your Browser's CACHE, and try to use the template from this URL: https://www.jotform.com/form-templates/search/opt-in
You can also check the same template on my Demo form: https://www.jotform.com/62554307734962
If you need further assistance, feel free to revert back. Thanks.