This tab allows detailed control over which axes are shown. The default is that the closest axis to the viewpoint is shown, with 5 tick marks per axis. The default upper and lower bounds for the axes are determined from the project data. For the Z-axis (depth), the labels at the minimum and maximum value are not displayed by default, as this results in the labels intersecting each other and obscuring the numbers.
The checkboxes under At Min? and At Max? control whether or not numbers are shown at the respective minimum/maximum for a particular axis.
If you want to have control over which axes have numbers shown, uncheck the Show closest axes only... checkbox and then pick the desired axes from the area below.