How can I move a single item from Forest Pack?

Hi friends. I have a scene created in 3DsMax that contains some elements created with Forest Pack. That scene has been exported to Unreal with Datasmith, and the conversion worked very well.
The problem is that when you select a single item, all instances are automatically selected. I just want to move one of the instances that is out of place, but I can’t find a way.
All instances of that Forest element act as the same actor as you can see in the attached image. You can also see the structure in the detail panel.
I could fix this in 3DsMax and export back to Unreal, but it’s not a viable solution.

I update information. I’ve turned the Forest Pack actor into a Blueprint, so now I can get into it. However I can only select one of the objects (I assume it is the original mesh). I can’t select any of the other instances.