Hello MattyD,
Thank you for contacting us. Unfortunately, since the “Header” is part of the theme, changes will display on all pages. This is because WordPress calls in the header.php file to display on top. While it may be possible to make a workaround, it will require custom PHP, or CSS coding. It looks like this is not possible in Beaver without custom code as well, see here. I could not find a post regarding this on Live Composer’s website, but it is most likely similar since it is powered by WordPress as well.
Also, keep in mind that it is common for sites to have the same header on each page since it provides continuity with navigation links, and menus, etc.
Thank you,
John-Paul