You can select an axis in any of the following ways:
Click directly on the axis in the scene.
Tip: If you have numerous overlapping axes in the scene, press and hold Q while clicking to cycle through each axis until the axis you need is selected.
Go to Schematic view and click the node for the axis.
Display the Channel Editor and select the Axis folder or one of its channels.
Use the Prev and Next buttons in the Axis menu to select the previous or next axis.