I'd like to use a forest object only for the shadows they create and so would normally just select the layer, uncheck visible to camera etc. and that would do it. It doesn't seem to work on forest objects and I can see from a previous post back in 2016 the workaround suggested was to convert the object to instances using forest tools.
The problem with this is that I'd like to move the objects around in the items editor and change the geometry/distribution so converting to instances pretty much means the positioning is set without moving things individually. Is there a way to make the object invisible to the camera?