The visual features of the Axis are set in a similar way to the visual features of a category. So the articles in Setting up the visual features of a category apply to the axis as well. Make sure to have a look at the visual property reference to learn more about each of the different axis visual features.
Select the “Axis” Tab in the chart’s inspector
Setup the visual features of the Axis
In a similar way to Setting up the visual features of a category
Configure the visual features
according to the visual property reference