Hello, @Isabel Lima,
Thank you for selecting XStore as your WooCommerce WordPress theme.
We understand that you are inquiring about the close button in the image provided (https://postimg.cc/Ffg853g9).
If you would like to remove this close button, please navigate to XStore > Theme Options > Header builder > Promo Text > Close button > Turn OFF and save the settings. After this, please clear your browser cache and check back to your site. For reference, please see the image provided (https://postimg.cc/TyVwz74p).
If you have any further questions or concerns, please do not hesitate to contact us. Our support team is always available to assist you.
Best Regards,
8Theme’s Team