Hello, @Abubakar,
Essentially, the theme colors feature operates on the website, but certain elements such as the header, footer, blocks, and specialized content are sourced from the template builder. The template builder takes precedence over the theme options in determining these elements. To modify the colors, you need to edit the content within the template builder of the theme. For guidance on using the template builder, please refer to this article: https://alpustheme.com/alpus/documentation/category/template-builder/
Best Regards.