Sometimes you might need more screen space to view large reports, one way to do that is to autohide (or minimize) the ribbon.

I call it autohide, because when it is minimized, the ribbon tabs will still be visible and clicking on a tab will automatically display its corresponding ribbon page, if you click on a button or move your mouse away, the ribbon will automatically hide again.

To hide the ribbon, you can double-click on a tab or use the right-click menu to select "Minimize the Ribbon" (see attached picture)

To bring back the Ribbon, right click on a ribbon Tab then uncheck "Minimize the Ribbon".