You can configure the [rover_idx_full_page] layout any way you would like. The default layout is "left" – which has the search panel in the left column, and the search results in the right column. When you want the search panel on top of the page, using the navbar is a nice full-width search bar solution.

[rover_idx_full_page cities="Harwich" full_page_layout="top" search_panel_layout="navbar" navbar_is_fixed="false"]