Is it possible to edit the page header for career site to make text larger and more visible?

Summary:

I am currently facing issues where I am unable to edit the page header content.

It is a requirement that the header links are not block capitals and for the size of the text to be larger.

However, it appears that the page header tool does not work as any changes made within the page header option does not apply to the career site (see below:)

Has anyone experienced similar issues?

If so it would be great to understand the solution to the issue!

Thanks!