GravityView - Sort by Address field when sorting by full address

gravityview-modify-full-address-sort.php

<?php

// Modify sorting when sorting full address
add_filter( 'gravityview/sorting/address', 'modify_gravityview_address_sorting', 10, 3 );

/**
 * Override how to sort when sorting address
 *
 * @since 1.8
 *
 * @param string $address_part `street`, `street2`, `city`, `state`, `zip`, or `country` (default: `city`)
 * @param string $sort_field_id Field used for sorting
 * @param int $form_id GF Form ID
 */
function modify_gravityview_address_sorting( 'city', $sort_field_id, $form_id ) {
  // Change below to any of the allowed options: street, street2, city, state, zip, country
  return 'street';
}