Adding/editing a Navbar

[Mac Hine]

Your tip about using ctrl E and then editing the theme Colour was good, thanks.
I've only just realised that editing “Local Fill Colour” is absolutely wrong regarding the navbar. No wonder I was struggling.

However I try, to edit the Navbar properties and the Pop-up menu style it has no effect on any of the navbar items.
On your fonts screeshot, it looks to me like those Button 1,2,3 in the background must be selected (with the dots around them?)
You can see on my screenshot I don't seem to have the same. Is that relevant?

I must be missing something obvious here.