You can change the drawing sheet format, size, orientation and scale. If standard paper sizes do not match your needs, you can also enter a custom size (width x height). A variety of diagram size scaling options are available.
Head into File-> DesignSpark options -> Detailing -> Size and Format to customise.
The developer supplies some Drawing sheet templates in different paper sizes and can be found at this location: C:\Program Files\DesignSpark\DesignSpark Mechanical x.x\Library\DrawingFormats
Replace x.x with you version of DesignSpark Mechanical (like: 4.0, 5.0, etc.)