Secondary X-Axis

Drill Down Combo Bar PRO supports two independent Y-axes on the same chart. This feature can be used to accurately display multiple series on the same chart in cases where their value ranges vastly differ (for example, revenue in millions and employee count in hundreds).

Enabling this toggle will create a secondary value axis which can be customized independently from the Primary X-Axis. You can then go to the Series Configuration section of each individual series to assign them to your desired X-axis with the Value Axis setting.
Gridlines are not available for Secondary X-Axis.