Contact form 7 >= version 5.1 both reCaptcha v2 & v3 won't display in the UI regardless on reCaptcha keys in Integration tab.

form contact_form

Solution:

1. Install Advanced noCaptcha & invisible Captcha (v2 & v3) in plugin page. nocaptcha

2. Add the keys in the plugin settings

3. Tick the box where reCaptcha is needed from the list

   • Login Form
   • Registration Form
   • Multisite User Signup Form
   • Lost Password Form
   • Reset Password Form
   • Comment Form
   • bbPress New topic
   • bbPress reply to topic
   • BuddyPress register
   • WooCommerce Checkout

*Note: For other forms

To show noCaptcha in a form use do_action( 'anr_captcha_form_field' ) OR [anr-captcha] To verify use anr_verify_captcha(). It will return true on success otherwise false.