When previewing an unpublished theme, which of the following is not true?

The assertion that preview links can access checkout as long as the store is not password protected is not true. When a theme is unpublished, the primary purpose of the preview link is to allow theme developers or store owners to test and review the design and functionality of the theme without exposing the store's checkout or customer information to others. Therefore, checkout functionality is specifically not available via preview links, regardless of whether the store has a password set or not.

Creating a unique preview link allows developers to share their design work without going live. Preview links are indeed unique subdomains of shopifypreview.com and are restricted to certain capabilities to ensure store security while allowing for robust theme testing. Furthermore, preview links typically remain active for a set duration, such as 14 days, providing enough time for review and adjustments without the risk of indefinite exposure.