Let’s try this please:
– Remove any custom css you might have added regarding the navigation bar.
– Go to “Appearance > Customize > Layout”
– Set heade width to “full”, header alignment “center”, navigation width to “full” and and navigation position to “below header”.
Then lets see the result and if we need to adjust more.
Agressively support the kind of work you want to see. Buy it. Talk about it. Review it.