Changing the Header for only one Confluence Space, not affecting other Spaces

Hi,

We have installed Adaptavist theme builder plugin recently into Confluence.
I have a requirement to set up a Confluence Space(which uses Theme Builder) with a Header which is different from the default Header used in the instance.Can anyone advise if this can be achieved and if yes, how?

The below shows the default header used in the instance. How can i change the header ONLY for a space ,say ABCD, where i would replace the literal "Confluence" with "ABCD"?

Thanks in advance.
Gouri