How do I reset -n switch?

[Ritergeek]

For no reason that I understand, GIMP has suddenly begun launching two instances. I understand this is related to a setting on the -n switch, but I have no idea where to find this switch to turn it off or redefine it. I am unable to find any information about this anywhere on the web or this forum other than the discovery that this switch exists. I do not see it in preferences. Where else does GIMP 2.10 store settings