Final answer:
To switch the rows and columns in the chart, the data points should be grouped into data series by PO Month. The font size for the chart is not specified.
Step-by-step explanation:
To switch the rows and columns in the chart, the data points should be grouped into data series by PO Month. This means that the PO Months (such as January, February, etc.) will be listed as the series on the x-axis, and the data points (such as sales, revenue, etc.) will be listed as the categories on the y-axis. The font size for the chart is not specified in the given information, so we cannot determine the exact font size based on the given question.