You would need to activate the module from Appearance >Nevo Options > Header Builder Items.
After activating a module click on Customize > Header option to get started. Drag Vetical Menu item into a header row to add it and then click to Vetical Menu to open item settings.
Vetical Menu Settings
- Icon: icon next to label text.
- Height: height of title box.
- Width: width of title box.
- Text: title box label.
- Color
- Background color
- Fly out: Open on front page.
- Fly out Styling: custom vetical menu.