You can do this adding an Extra Axis command and hiding the default axis.
Step 1: Under the Command menu, select Add Extra Axis (near the bottom of the menu)
Step 2: Change the Portion setting to ‘Above’
Step 3: Hide the default axis by unchecking ‘Draw x-axis’ on right side of the Axis settings.
So this is slightly different than moving the axis, you are actually adding a drawing command that has more flexibility