HUB Elementor - Fullscreen Nav Menu

First of all, from the Templates menu, click on the "Saved Templates" section. If you have a "Header Fullscreen Nav" section, you can edit it with Elementor.

If not, you can import the .json file I have attached by clicking "Import Templates" above, as in the image, and then edit it as you wish. 

File: elementor-5029-2021-11-01.json

Then enter your header edit with Elementor from the Header menu:

Type “Liquid Fullscreen Nav” on the widget search bar.” And drag the tool to the desired section. 

Click on the widget and enter edit. Select and save what you have added from the "Select Fullscreen Menu" options.