reducing header size

hello guys,
Thanks again for your last help, it’s getting better now.
Just a matter of design, is there a way to reduce the width of the header menu (www.zi-zag.world) in agama blue. I mean that wide white space is nice but I can’t find a way to make it smaller. on top position I mean, the rest is very good and I like how it behave when scrolling down (header v3 it is)
thx