By default Aspose.Words for JasperReports use 1 column in output report. But you can change the default value by specifying the required number of columns (between 1 and 4). Use COLUMNS_COUNT parameter for that:
JasperReports:
[Java]
import com.aspose.words.jasperreports.*;
AWDocExporter exporter = new AWDocExporter();
exporter.setParameter(AWExporterParameter.COLUMNS_COUNT, 2);
exporter.exportReport();
JasperServer:
[XML]
<bean id="aw_exportParameters" class="com.aspose.words.jasperreports.AWExportParametersBean">
<property name="columnsCount" value="2"/>
</bean>