Before you publish any changes, preview them so you can see how they will appear on your live store. Nothing you do in a preview session affects your production storefront.
To launch a preview session at any time, click the Preview button. The preview session launches in a new browser tab or window. If your instance supports more than one store, select the store to preview from the drop-down list at the top of the preview window. To end the preview session, simply close that tab or window.