xerse Hi
I want to clarify that this isn’t a bug with the template. The class was intentionally added to the header block.
With T4-based templates, you can easily adjust the container's width by setting it to Fixed, Fluid, or None. In this case, the header block has that class, which is why it’s not displaying at full width—this is by design, not a bug.
You can clone this block + remove that class as you wish so it will not be affected when you update the new version of template.
Regards