I’m assuming you’re using the standard character setup, with a SpringArm, and the Camera outside on it.
There’s a simple checkbox that can fix this behavior.
Select the training dummy, scroll to “Collision” and change the collision response for “Camera” trace queries:
This says “this object doesn’t block camera queries.”
This will generate clipped geometry if the camera happens to “zoom through” the body of the dummy. Thus, you may still want to hide the dummy if it’s really close to the camera, but maybe your particular camera management and angles work well enough without that.