Hello, @Patronela,
1. Sound’s Good!! that you found it.
2. I am sorry but I understand it wrong, I thought you were asking for the same section under the cart for bold. Well. as now you provided the screenshot, I understand it.
You can make that promo text bold using Custom CSS, Please copy and paste the below-given CSS code to XStore >> Theme Settings >> Theme Custom CSS >> Global and check back to your site after removing the browser cache.
div.header-promo-text {
font-weight: 700 !important;
}
Note: You can change the value in the given code as per your requirements: https://www.w3schools.com/CSSREF/pr_font_weight.php
Regards 8Themes Team.