To alter address formats in invoice (https://www.webtoffee.com/product/woocommerce-pdf-invoices-packing-slips/)

functions.php

<?php //do not copy this line

add_filter('wf_pklist_alter_shipping_address','wf_pklist_alter_address_formats',10,3);
add_filter('wf_pklist_alter_billing_address','wf_pklist_alter_address_formats',10,3);
add_filter('wf_pklist_alter_shipping_from_address','wf_pklist_alter_address_formats',10,3);
function wf_pklist_alter_address_formats($address, $template_type, $order)
{
	if($template_type=='invoice')
	{
		$arr=array($address['country'], $address['postcode'],$address['city'],isset($address['address_1'])?$address['address_1']:$address['address_line1'],isset($address['address_2'])?$address['address_2']:$address['address_line2']);

		//you can alter separator <br/> in below statement
		$address['city']=implode($arr, "<br/>");
		unset($address['postcode']);
		unset($address['state']);
		unset($address['country']);
		unset($address['address_1']);
		unset($address['address_2']);
		unset($address['address_line1']);
		unset($address['address_line2']);
	}
	return $address;
}