UE4 SimpleAR Changing actor class while running in DebugMenu

Hey, first of all I’m a beginner, so sorry if the description of my problem sounds weird and its a minor problem.

In the SimpleAR Project I want the user to be able to select one out of several objects, the selected one should be spawned as an actor.
I made some check Boxes, if one object is checked, the Actor class in SpawnActor should be changed. Thats where I’m stuck, I don’t know how to access the actor class from the event Graph of the DebugMenu.

I couldn’t find a solved question similar to this, glad if somebody can help me with the blueprints.