Let’s check how to set Sticky Navigation Menu on the Elementor page. Make sure if you installed Master Addons free plugin in your Website. Otherwise, it will not work. The sticky nav menu is not an element that you need to drag and drop. It’s available inside the “Ma Navigation menu” element.
There is an option to enable the sticky option. Enable to the sticky menu and you will see multiple sticky types.
Before all of this make sure to put a CSS ID to the header main section which you want to make sticky while scrolling.
Just copy that section CSS Id and paste it into the navigation menu sticky option.
More info:
source