In order to use the theme like a landing page you need to add widgets to the Home Page widget area.
Here you can see what widgets were used for our demo page.
Once you added all widgets you need to configure the menu.
Go to Menu > and select "Main Menu Homepage".
Add links to the menu like in the next example:
Note: Each widget has an ID for ex: the Speaker widget has the ID "speakers", take a look at the image below.
or you can see the ID when you edit a widget.
Add the links to menu: