Hi There,
Go to Appereance > Customizer > Stacks.
Select Ethos.
Go to Appereance > Customizer Header > Select Inline Header.
Still on Appereance > Customizer > Header you have a few parameters to adjust the link spacing play with it, depends on the amount of links you have.
That is it.
Once you have done that, please provide us the URL and the points you would like to improve so we can help you.
Thanks
Joao