Navigate to General Content > Menus > Settings:
Click on the dropdown to collapse from the available Headers/Footers and select one:
Once you select the desired default Header/Footer click on the Update button.
Quickly setup default headers and footers
Navigate to General Content > Menus > Settings:
Click on the dropdown to collapse from the available Headers/Footers and select one:
Once you select the desired default Header/Footer click on the Update button.