Hello,
The header width depends on the General Layout of the site. If you want to make the boxed header, you need to set the Boxed layout in the Theme Settings > General layout, and the header would be boxed.
Regarding to your highlighted screenshots, Navigate to WoodMart > Header Builder > Edit Current header and click on the Settings button and enable the “Make it overlap” option and “Make it boxed” https://postimg.cc/xXnQMK6H
Best Regards