Navigation Setup
After installation & One click demo import go and check home page if navigation is broken(see below image) then follow below steps.
Header Default
Go to Appearance > Editor > Template Parts > Header
Click the 3 dot dropdown menu
From the drop-menu choice Primary Menu.
Assign same menu(Primary Menu) as mobile menu.
Result
Header-v1
Go to Appearance > Editor > Template Parts > Header-v1
Assign Primary Menu as mobile menu.
Assign Primary Menu.
Result