Previewing a Theme
Browse to Themes > Not Active Themes
Click the Gear
- Select Preview
This will open a new window with the theme applied to the site selected. It will appear that it has changed the site, but this is ONLY FOR YOUR SESSION. Other users see the site with the normal theme applied.
This happens because Spark Pay drops a cookie into your browser, locking you to the theme. You can clear your cookies to reset it back to the currently active theme.