Each page you create with Avada will have default top and bottom padding applied. The page top padding starts directly below the header, and the page bottom padding directly above the footer area as illustrated below. Aside from the main header, there are also some elements on your page that may sit above the top padding, such as the Page Title Bar, and Sliders in some cases.
You can set a global top and bottom padding for the page content in Avada > Theme Options > Layout tab under the Layout section. This can be overridden on individual pages via the Fusion Page Options.
You can choose to set the top and bottom padding for individual pages in the Page tab in the Fusion Page Options box. This will override the global option set in the Fusion Theme Options.
If you add a Fusion, Revolution or Layer slider using the Fusion Page Options, then the slider will sit above the top padding. This means that setting a Top Page Padding will not affect the slider.
If you add a Fusion, Revolution or Layer Slider using one of the slider elements in the Fusion Builder, then the slider will sit below the top padding. This means that setting a Top Page Padding will affect the slider.