Please do the following steps to setup Navigation and Sub Navigation on header layout:
- Click Appearance
- Click Theme Options
- Click Header settings

Setting up Navigation Header:
- Click Appearance
- Then, click on Theme Options
- Navigate to Header settings
- Click on Navigation settings

Setting up Sub Navigation Header:
- Click on Appearance
- Then, click on Theme Options
- Navigate to Header settings
- Click on Navigation settings
- Here you can setup Sub Navigation on the footer section

