The “laser pointer” is in fact the debug line in the MotionControllerBP/Widget Interaction. By default I’ve linked them to options in the MainMenuPC VRSettings panel, but you can also manually switch it on or off in the MotionControllerBP. I’ve put the related boolean in a RepNotify, and ensured that the debug line is coming only from right controller.
Keep also in mind there’s a bug in 4.16 and 4.17 with the debug line and the Instanced Stereo Option.