Hello Jennifer,
The New Label Range limit takes into account the “last update or modification date” of the product. If you select more than 10 in the New Label Range option, it will display on more products on your site.
Additionally, please review this thread for further information: https://www.8theme.com/topic/xstore-badges-new-label-range-limit-does-not-work/. It may be of assistance.
Best Regards,
8Theme’s Team