Can't get cast/reference to work with trigger BP and actors

I’m having a problem which I find quite strange, I can’t command a Trigger BP to do something, like destroying/Set Actor Location, unless I do an ActorBP reference, and allow to be editable, then I insert the actor instance from the level into the details-default, however, I need to do that without having to do such thing.

Why such thing happens? I’ve saw Matthew Waldstein video using UMG and the variables are not set to be editable.