Hi,
what Animation editor are talking about? can you make a reference or a screenshot?
I know for sure ( and it's a real shame), that Unity messed up a bit with the name "animation" and it's very very confusing right now, because there is two types of animation, one for mecanim and one for legacy. and it's mess cause switching between the two is not clear not well documented.
You may be experiencing this, and in which case, you should report a bug to Unity, so they get as much complains as possible on that matter to properly adjust their interface to make it obvious.
Bye,
Jean