You can add new projects through Services → Add New Service in the WordPress Administration Panel.
Services contain most of the same options as standard posts. You can read about these in the Add New Post chapter. Additionally, they contain post options specific to services.
Service Options are found below the editor on the Edit Service page. If the Service Options are not visible, make sure they are checked inside the Screen Options area at the top.
The image will be displayed in the header of the page, the required dimensions: (1680 x 275)
Select the sidebar position. Chose No Sidebar for Full-width page.