Hello @Kola,
1. Thank you for providing the login details. I have reviewed your website and successfully changed the header main color, as evidenced by the images provided here: https://postimg.cc/Q9NGZFpT and https://postimg.cc/47xQpcCw.
We have noticed that the header main color does not change in live mode when the customizer mode is activated due to the CDN being enabled on your site. To resolve this issue, we recommend flushing the server cache completely and temporarily disabling the CDN until you are in development mode. To do this, please contact your service provider and ask them to do it. Please refer to the image provided here: https://postimg.cc/kDJCSpRy
2. To change the main color for the site (color of links, active buttons and elements such as pagination, sale price, portfolio project mask, blog image mask, etc.), please navigate to XStore > Theme Options > Styling/Colors and select the Main Color of your choice. For reference, please see the image below: https://postimg.cc/dD4tWTbr
Best Regards,
8Theme’s Team