Figured it out. Select the chart, then in the "Properties" panel, in the "Chart" section, click the "..." button next to ChartAreas (Collection). This brings up the ChartArea collection editor window. Under the axes in the right column, click the "..." button next to CategoryAxes. The ChartAxis Collection Editor window will appear. In the "Appearance" section, select the "Visible to True" radio button.
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