Hi @wicara,
You can do anything with this Theme, but the customization work does not come under the Support.
What you are asking is the required customization of Header, which you can do with the Header builder available with the Pro. So, if you are using the Pro, you can customize the Header as you want to.
And if you are using the X, I would suggest you upgrade to the Pro theme to get the Header Builder, please go through the process here: https://theme.co/docs/converting-from-x-to-pro and then go through the following article and video on Header Builder.
I would also suggest you go through the following article and video on Header Builder.
https://theme.co/docs/header-builder-overview
And then you can add the following Navigation element for the desktop:
- Navigation Inline
And then you can add the following Navigation elements for smaller screen:
- Navigation Dropdown
- Navigation Modal
- Navigation Off Canvas
And adjust the Navigation by using the Customize > Hide During Breakpoint option to show/hide in the specific screen size.
Hope it helps.
Thanks