The axis menu (alt-X, alt-Y, alt-R)

Right-clicking on any axis will bring up the corresponding axis menu. 

g Axis name
Names the corresponding axis.

g Axis name font
You can select the font of the axis name. The font will be identical for all axes.

g Axis grid labels
You can display or hide the axis labels for each axis individually.

g Axis grid label font
You can select the font of the axis grid (the numeric values alongside the axis). The font will be identical for all axes.

g Axis grid divisions
If you are not satisfied with the automatic number of divisions, you can add a custom value here by choosing "manual".

g Range (Zoom) 
Sets the viewing range of only the selected axis (zooms in or out). You can also zoom all axes simultaneously by using a zooming rectangle or the zoom menu.

g Auto scale 
Auto scales one axis only. To auto scale all axes, press F5 or use the auto scale command in the view menu.

g Reverse 
Flips over (mirrors) the plot.

g Precision
Gives the number of decimals to display on the axis values. By default the program tries to set an optimal precision based on the content of the data sets. If the precision is set manually, this setting will overrule the auto setting as long as the program is loaded.

g Format
You can choose between decimal or scientific display format for each axis individually.

g Format g Time format (X-axis only) 
If the X-axis unit is in seconds, this function converts these seconds to a more useful display value: 120,000 seconds becomes 1d9h20m0s. The X values themselves stay untouched, only the graph display changes.

g Logarithmic
Displays the corresponding axis in logarithmic scale.

g Gain
This one is a bit tricky. It multiplies the display of the given axis by the number you specify. It does not alter the data. This can be useful with data files that consist of one column. The X-values will be 0, 1, 2, 3, etc. and setting a gain on the X axis can alter the display without altering the data. Or, in 2D view mode, the gain can be used to give the Y axis a more meaningful value.

g Offset: 
As with the gain, it does not alter the data, it just offsets the axis value.