Hello,
That comes from the third-party plugin that you use https://prnt.sc/boXhWOaT2yJl (Stripe for WooCommerce or something similar). So, check the plugin settings or contact the plugin author to disable that. Or hide that using custom CSS (Theme Options > Custom CSS)
.product-information .cart #wcpay-payment-request-button-separator {
display: none !important;
}
Regards