Go to Sections > Header design x (x is the design you choose)
You can choose Header design in Theme settings. Please follow this instruction.​
2 - Custom Header height (60-160px)
2.1 - 60px
2.2 - 160px
2.3 - Show dropdown arrow?
3 - Mega menu
Left
Center
Right
4 - Content
Before the tutorial I have a explanation:
Ok, now follow steps below:
The parent menu is the menu level 1. Usually it will always be shown in the header. The child menu is the menu level 2. Usually it will show up when you hover on the parent menus.
4.1 - Megamenu (parent)
4.1.1 - Heading
4.1.2 - Link
Choose link when you click to 'DEMO' it will be navigated to that link
You can set go to homepage, collections, products and so on.