This template serves to display the content of the "page" type posts with design that differs from the design provided for the rest of the pages of the site. The template makes it possible to display both the whole content and excerpts from the content (the first 100 symbols), that's why if you want the excerpt to differ from the content, the field "Excerpt" should also be filled out in the post editing window.
To display a post in this template, it is necessary to select "Unity Custom Page" in the drop-down list "Template" in the post editing window.