How to remove Print Invoice button in tracking result

Copy this code in functions.php of your active theme

add_action( 'init', 'remove_wpcargo_track_shipper_details' );
function remove_wpcargo_track_shipper_details(){
	global $wpcargo_print;
	remove_action( 'wpcargo_print_btn', array($wpcargo_print, 'wpcargo_print_results') );
}