Moves the Google reCAPTCHA notice after all fields before the submit button in WordPress comment form.

wp-comment-form-google-recaptcha.php

/**
 * Move Google reCAPTCHA after the comment form fields and before the submit button.
 */
add_action( 'init', function () {
	if (
		has_action( 'comment_form_logged_in_after', 'gglcptch_commentform_display' )
		|| has_action( 'comment_form_after_fields', 'gglcptch_commentform_display' )
	) {
		remove_action( 'comment_form_logged_in_after', 'gglcptch_commentform_display' );
		remove_action( 'comment_form_after_fields', 'gglcptch_commentform_display' );
		add_filter( 'comment_form_submit_field', function ( $submit_field ) {
			ob_start();
			gglcptch_commentform_display();

			return ob_get_clean() . $submit_field;
		}, 0, 1 );
	}
}, 50, 0 );