The section content type has an edge to edge display so no sidebar is shown. It is possible to remove the standard "header" region and then use Components to build out the page. In this example we are using a page section to encompass two other components (node list and fast facts). The page section has a background image modifier on it to display the image of the flower and a dark colour palette assigned so that the text will be white.
Convivial for GovCMS has a number of other flexible page authoring concepts which can be utilised by editors to build out flexible page if required.