I am creating a one page printable report. See an example attached.

        $report->export()
            //           ->settings([
            //               'useLocalTempFolder' => true,])
            ->pdf(array(
                "format" => "A4",
                "orientation" => "portrait",
                "margin" => [
                    "top" => ".5in",
                    "bottom" => ".5in",
                    "left" => ".5in",
                    "right" => ".5in",
                ],
            ))->toBrowser($szFilename, FALSE); // Input the filename   make this true to pop open a window

Why is this report not extending to the bottom of the page? I think I need to increase the font size and then use trial and error? Where do I modify the font size?