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Right click on one of those dates in the axis. Select "Format".
You should be placed into the format-pane screen (on the left side of your screen), and under the "Default" section, you can pull-down and select "Custom" to format your date. Type in MMM/YY and you should get the format you need.
Thank you Joe, it was helpful.
Though I was trying the same technique I was missing it some steps, you detailed answer helped to solve!