Email НЕОБЯЗАТЕЛЬНО

Добрый день. Попробуйте так

add_filter( 'rcl_profile_fields', 'email_no_required_profile_field', 10, 2 );
function email_no_required_profile_field( $fields, $args  ) {
    $opt = [];
    foreach ( $fields as $field ) {
		if ( $field['slug'] === 'user_email' ) {
		  $field['required'] = 0;  
		}
		$opt[] = $field;
    }
 
 return $opt;
}