In the editor. The cart and checkout work while you edit. Orders placed from the editor are always test orders, even when your store is in Live mode. They appear in Sales marked TEST, and their emails have [test] in the subject.
On your published site. With Payments → Mode set to Sandbox (test), your published site runs as a test shop:
Your published site fetches your store's details every time a page loads. Much of what you change in the Store therefore reaches your site without publishing.
A shopper who is already browsing your site sees changes to shipping, payments and currency on their next visit.
Adding a new product changes nothing on your site until you place it on a page with a Product block and publish that page.
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