All can be done in the header builder.
This documentation may be a helpful resource for you: https://xtemos.com/docs-cat/header-builder/?theme=woodmart it helped me figure things out.
Essentially You need to go Theme Settings and look at the top where you’ll see an option labeled Header Builder, click it and then you can edit your header, you pick and choose the widgets and where they are placed. Within the settings for the widgets you’ll find options for things like the color. To change the background color of a bar in the header then you’ll need to hover over the one you want (Top, Middle, Bottom) and then you will see a ”cog” icon appear on the left, click this and you will find the settings you need.