The Reverse Horizontal property is used to flip the chart horizontally. Below is an example chart with the Reverse Horizontal property set to false (you can see the X-axis values going from left to right).

If the Reverse Horizontal property is set to true, the chart will be horizontally reversed. Below is an example chart with the Reverse Horizontal property set to true (you can see the x-axis values going from right to left).

By default the ReverseHorizontal property is set to false.