Your X-Cart storefront can be finetuned for your needs by changing options in the etc/config.php file at the [storefront_options] section. Here is the reference for the available option values:

Don’t Close Callback Endpoint When the Storefront is Closed for Maintenance

If the callback_opened option is set to On, target=callback will be available for payment processing and IPN (Webhook) notifications, even when the storefront is closed.

Optimize Visible CSS Loading

When the optimize_css option is set to On, X-Cart will inline all CSS styles (used on the current page) in the <head> tag, complementing them with the <link> tags for the first load only. This will allow to show the styled page as soon as possible, and then the browser cache kicks in on each consecutive load.

Force Custom State with Autocompletion

This option will allow the customer to set a custom state for the countries with defined states (defined states will be available as the autocompletion for the ‘State’ field).

Set the autocomplete_states_for_countries option to the comma-separated string of the country codes like this: GB,US,DE, All or leave empty to disable this option.