The "interact" tool is a native sketchup tool. Per the sketchup tooltip it is used to "trigger the interaction behavior of a dynamic component". This is frequently implemented within sketchup in the form of doors that can open and close, drawers that can slide in and out, etc.
Ideally, this tool would be available within the enscape rendering window and within enscape VR, allowing preset dynamic component interactions created in sketchup to be activated without leaving the enscape render window or VR environment.