You can disable it with this css
.grecaptcha-badge {
display: none;
}
BUT, to remain compliant with the google terms of service you must include this with your forms using it (in the users flow), so under the form submit button would be a good place):
<small>This site is protected by reCAPTCHA and the Google
<a href="https://policies.google.com/privacy" target="_blank">Privacy Policy</a> and <a href="https://policies.google.com/terms" target="_blank">Terms of Service</a> apply.
</small>
Feel free to comment if you can add help to this page or point out issues and solutions you have found. I do not provide support on this site, if you need help with a problem head over to stack overflow.