You can:
Note: If your changes result in a geometric impossibility, or cause problems in subsequent features, you will be warned by the Conflict Solver.
Editing the Axis by the Feature Guide
Right-click on the Axis name in the Feature Tree, or select the axis and then right-click. In the popup menu that appears, select Edit Feature.
The Feature Guide will appear, automatically open to the last required step. You now return to the same situation in which you created the Axis.
Make modifications in the current step, and / or click the icons for
other steps to modify. Press OK
or Apply 
in the Feature Guide to complete the function.
If you want to resize the axis for display purposes, select the axis. It will be highlighted and drag handles will appear at both ends.
See also: