Hello, @LMcompany,
Thanks for the screenshot I have understood your issue.
1- Now, In order to solve your issue simply go to the Dashboard >> XStore >> Theme OPtions >> Theme Custom CSS >> Global and then paste the below code at the bottom of the CSS box there.
.single-product-wide .product-information{padding-top:0px !important;}
Then save settings and check back to your site after clearing the browser cache.
2- Simply navigate to the Dashboard >> XSTORE >> Theme Settings >> WooCommerce >> Single Product Layout >> and enable the “Stretch Add to cart button” option from there see the image: https://postimg.cc/8j5WD9TZ then save settings and check back to your site after clearing the browser cache.
Regards 8Themes Team.