reCAPTCHA mandatory in the Contact Template

Hello, I have been buying your theme a few days ago.
Now they have managed to enter the reCAPTCHA by following this thread: https://webriti.com/support/discussion/5591/how-to-add-recaptcha-to-appointment-theme-pro-contact-form.

But the message can not be sent without selecting reCAPTHCA.
How to insert mandatory the selection of "I am not a robot?"
Thank you

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