If the menu is not available after the import, you can fix it.

1. Navigate to Appearance → Menus and select Manage Locations tab
2. In this tab, set the appropriate menu types
3. Save your settings and check it

Menu Locations

If you have header v1 or v2, those headers use 2 menus. One for the left side, and one for the right side. You can assign which one to use for each side:

Primary Top Menu

Used for Left Side

Secondary Top Menu

Used for Right Side

Footer Menu

Used as menu after Copyright in the footer

Mobile Menu

Used for Mobile Drawer Menu

Socials Footer