Function set_page_setup 

pub fn set_page_setup(
    ws: &mut WorksheetXml,
    orientation: Option<Orientation>,
    paper_size: Option<PaperSize>,
    scale: Option<u32>,
    fit_to_width: Option<u32>,
    fit_to_height: Option<u32>,
) -> Result<()>

Set page setup options on a worksheet.

Only non-None parameters are applied; existing values for None parameters are preserved.