You can select an axis in any of the following ways:

• Click directly on the axis in the scene.
  TipIf 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.