Once in the Roof Sketcher mode, either select the Pick tool and click on a room, to create a roof whose base takes the room's form; or, use the line tools to manually draw the roof base's outline.

Select each edge, and in the left hand panel, under Roof Edge Settings, define the Slope Angle (degrees) in the corresponding field and set the Roof Edge Visibility to 'Visible'. For a hip roof, all sides will have the Roof Edge Visibility set to 'Visible'.

Click on Apply to apply changes.