The Kadence Theme doesn’t use any page templates to determine how the page layout will show, it’s all done through page/post settings. You can define settings that will apply globally to your page or post through the customizer. ( customizer > page layout or customizer > blog posts > single post layout ).
You can also control these settings for each and every page of your site which allows you to make custom landing pages with no header or a boxed page with a sidebar. You access these settings from within the post edit screen. Click on the page edit icon in the top right corner.
Once selected you will see options to control your page layout.