How do you merge linked or appended objects into a single layer? After appending (not linking) a few objects from a different scene, the appended objects appear in all layers like this.



How does one put the appended objects on a single layer to turn on/off? After deleting the linked objects, the layers look like this:
An object can be present in more than one layer.

In the Relations section for the object you can select which ones to use.