Yes, using the code supplied the CV light is on. That's not the issue. Changing the code from G64 to G61 will turn CV off which the CV light goes out on the Mach screen as well.
Either way, the code as is when it run on my machine will "whine" down to a stop and then whine back up when starting the next line of code. "Whine" is the sound of both the X,Y steppers making music.
I made a simple straight line with two segments. Just moving X on the X,Y plane the CV on or off changes the machine behaviour. Changing it to add Z as well also behaves correctly with and without CV mode.
These are G1 linear move commands. G2, G3 are circular move commands and based on what I'm seeing it appears CV is not implemented on circular moves.
Wayne