How to remove 'state' label when tip is set to true.

For the following grouped bar char, when tip is set to true the label ‘state’ appears in x-axis. How can tooltip can be enabled without displaying that label?

Link to grouped bar char


tip: {format:{fx: false}},

Thanks for your help Fil! However, I am trying to remove the ‘state’ label from the x-axis and not from the tooltip.

In that case, specify label: null on the fx option.