Address 2 field always show

address_1_field_always_show.php

<?php

add_filter( 'cartimize_get_billing_checkout_fields', 'cartimize_address_1_billing_fields_always_show' , 10, 1 );

function cartimize_address_1_billing_fields_always_show( $fields ){
    if ( !isset( $fields['billing_address_2'] ) ) {
        return $fields;
    }
    
    unset( $fields['billing_address_2']['is_hidden'] );
    unset( $fields['billing_address_2']['cartimize_optional_label'] );
    $fields['billing_address_2']['required'] = true;
    return $fields;
}

add_filter( 'cartimize_get_shipping_checkout_fields', 'cartimize_address_1_shipping_fields_always_show' , 10, 1 );

function cartimize_address_1_shipping_fields_always_show( $fields ){
		if ( !isset( $fields['shipping_address_2'] ) ) {
			 return $fields;
		}

		unset( $fields['shipping_address_2']['is_hidden'] );
		unset( $fields['shipping_address_2']['cartimize_optional_label'] );
		$fields['shipping_address_2']['required'] = true;
		return $fields;
}