Extend Title Name

First create a child theme for your changes. Or install a custom CSS plugin.

I have a custom CSS plugin, I just need to know which code to change. Not really interested in a child theme just for this one change.

Try adding:

#branding {
    width: 30%;
}
#menu-primary {
    width: 70%;
}

to your custom css plugin.

Wow, worked, so simple for someone who knows.

Many thanks.