CIty Sample Crowds in editor functionality

My goal is to enable the City Sample Crowds with animation in Editor.

So as a first step I need the spawning functionality to work in Editor.

This translates to adding Editor Tick functionality to the crowd spawning blueprint.

But when I open BP_MassCrowdSpawner there is no functionality in either the Construction Script or Event Graph.

The parent class is “Mass Spawner”

But where is this Mass Spawner class located? I can’t find it anywhere in my project!