Hi ! How i can make custom trace style? (VR)

Im beginner, so im started studying VR not so long ago.
Reading now “Unreal Engine VR Cookbook: Developing Virtual Reality with UE4” (nice book as for me) and i created ParabolicTrace function (projectile path) with sphere trace by channel in TraceInteractionComponent.
TraceInteractionComponent attached to MotionController(PAWN) (can be attached to headcamera or to both controllers)
ALSO i created LineTrace function (1*) and i can switch between ParabolicTrace and LineTrace.
Screenshots attached!
Can you help me change trace style for current parabolic trace (or for more simple straight line trace) and explain how it works in general, or maybe i should to choose more easy way))
Think a lot of people found this question very useful! Thanks!!!