Hi,
Well, first you have the settings of the custom fields of the table "address" that you can find when you edit them via the menu Display>Custom fields.
There, you'll be able to set a placeholder, change their order, add a checkbox with the hide/display mechanism using the "display limited to" setting.
To remove the labels, the best is to hide them. You can do so with CSS code.
www.hikashop.com/support/documentation/1...ize-the-display.html
If you really what to go further with the customization of the address fields on the checkout (like having them on two columns instead of one), you would need to edit the file checkout / sub_block_login_registration.php for the registration/guest form and the checkout / show_block_address.php for the address edit / new forms, via the menu Display>Views.