Hello,
You can adjust the buttons via Theme Settings -> Styles and Colors -> Buttons.
ACCENT BUTTONS. Buttons that are directly related to the WooCommerce purchase functionality.
DEFAULT BUTTONS. All others, such as WooCommerce, supported plugins, and theme options buttons that are not included in the above category, and those buttons that do not have their own button settings.
For the advanced button styles, please follow this guide: https://xtemos.com/docs-topic/advanced-button-styles/
If you have another behaviour, Please share some screenshots for better understanding that demonstrate the problem so we can understand and reproduce it on your website.
Also, share your Site WP-ADMIN Login details in the Private Content field so that we can check this concern on your Site and help you out accordingly.
Best Regards,