As noted above, there is no Save button at the bottom of the Page Options panel in the Fusion Builder Live Editor. All changes are updated on the page as soon as they are made, but with Avada Live, and the new Front-End Builder, we have combined the Save button for both page content, and theme and page options.
So now there is one main Save button, on the far right of the top toolbar. When no changes have been made, the icon is grey. It turns blue as soon as any change has been made, whether that is in page content, or theme or page options, and when you click it, the button turns temporarily green to show you it has saved before turning grey again. History states are also cleared when a page is saved.