Have you selected it, using the icons on the bottom line of the working screen
You should have the same icons on that line as you have oon the top line (sort of)
if you sre not seeing them go to extreme right bottom corner and use the control there to toggle it to the correct display
The icons I have are in the pic i posted b4, nothing marked water plane. I have a copy of the free 5.5 but have lost track of the serial for it.
AHA!!! I clicked on the infinite planes icon, chose ‘Plane 3’ and it was that one, I can now move it around. :-D