Sorry, works fine with C.V. forgot we were dealing with C.C. here.
You are correct, switching one out would make the supply increase the voltage to try to keep the current constant.
I think those Mean Well's I want are CV and CC, if that makes any difference.

Let's say I have 13V @ 4800 mA going to 4 blue LEDs in parallel. Each blue is drawing ~1200mA, yes? Now, I switch one blue out of the circuit. Do the remaining 3 blues divide the 4800mA if the voltage remains at 13V?
That's the part I'm not sure about. Maybe a safe way to check it would be "backwards," like setting things safely for one LED and switching a second one INTO the circuit, and seeing what the driver does in response?? :stoned: