To enable the debug settings go to the BP_PlayerPowerComponent and in the Class Defaults find the Debug category like the image below.

To enable debug mode first turn on the Debug Mode setting, you can then enable the debug setting you need.

Debug Placement – When enabled this will display the object name that the placement trace is hitting as well as while preview any object the preview device is having its placement blocked by.

Debug Interaction – When enabled this will display the name of the object that the interaction trace is hitting.

Debug Placement Angle – This will display the preview devices placement angle when placed on a surface.

Here you can also set the traces for placement, interaction and the cable collisions visibility so you can see the traces in game.