Hello,
The header width is controlled by the overall site layout settings, so it can’t be adjusted independently using only margins.
If you want to reduce the header width or create a boxed header effect, please follow these steps:
Navigate to Theme Settings > General Layout and switch the site layout to Boxed. This will automatically constrain the header width along with the content area.
Alternatively, if you want to control it only for the header, go to WoodMart > Header Builder > Edit Current Header and in the header settings, enable “Make it boxed”. This will apply a boxed layout specifically to the header instead of full-width.
https://postimg.cc/xXnQMK6H
Best Regards