Change the visibility status of the LiveChat feature of Smart Settings.

livechat_change

<?php
function my_livechat_visible( $display ) {
  return 'both'; // accepted values are 'both', 'admin', 'public' or 'none'. default is 'both'
}

add_filter( 'smart_settings_show_livechat_code', 'my_livechat_visible' );
?>