This theme comes with additional page templates: a Wide Page and a Blank Page. To assign one of these templates to a page, select one of them from the drop-down list in the Page Attributes panel of the Document tab when you create or edit a page.
If this panel is not on your Dashboard then you need to enable it in the Screen Options.
Create landing page via Blank Page template
To easily create landing pages, you need to activate the Atomic Blocks plugin. After activated it, an Layouts icon will appear in the top panel of the editor, as shown in the image below.
By click the Layouts button, you can select sections of your page or professional designed layouts of page and then edit their elements as your need.