These, as the name suggests, will be applicable for your axis charts like: Line Charts, Bar Charts, Area Charts etc of Open Source BI product Helical Insight v 5.0 GA onwards. These options help you to manage your grid and axes of your charts like enable/disable grid lines, hide or show axis, specify the axis range. You can navigate these options under Properties Module.

Then choose the meatball icon again and select Axis.

Grid lines
Once you are at this module, you will have option to enable or disable gridlines for X-Axis or Y-Axis or both.

Rotate the axis tick labels
By default the charts are created in such a way that axis ticks are intelligently oriented for easier visibility and no overlap. However you still have option to control your axis tick marks.
For dimensions or measures you can control the values on the axis by rotating it as you may seem fit for your needs. You can enter both positive and negative values. Like Source in this example, we have enabled rotation of 315° (or-45°).

Axis ranges
In case of Measures like sum_travel_cost in this example, we can also control the range of the axis. By default the chart axis range is dynamically created using the minimum value and maximum value preset in the chart.
However using this option you can specify the minimum value and maximum value of the range selector.

If you need you can also have the negative values of axis range also.

Hiding Axis
If you want you can simply hide the axis altogether for both dimension and measure as per you need. For measure, if you want to hide keeping the range, even that is possible.

These gives you precise control over how your axis charts will be rendered. Use it to your advantage only with Helical Insight 5.0