Hi h4z3.gene,
Thanks for reaching to us.
1. Navigate to Theme Settings > Typography > Advanced. In this area, you can search for Single product tabs
element and you can change font-size.
Please refer to our documentation https://xtemos.com/docs-topic/advanced-typography-settings/
2. Navigate to Theme Settings > Typography > Advanced. In this area, you can assign elements to below Custom Class:
div.cart-totals-inner>h2
3. Please add the below Custom CSS code to Theme Settings > Custom CSS > Global Custom CSS:
.related-products h2 {
font-size: 32px;
}
Regards,
Hung PD