Once upon a time, Layer Group was renamed to Layer Set.
I suppose one of the reason was the action “group Layer” and the layer (now named) “Group Layer” cause some confusion with “Layer Groups”.
However, the name “Layer Set” is a bit awkward to me and I can’t explain why 
But, source-code-wise, the word “set” for it is confusing with the verb. In fact, internally they are referred as “group” XD
I know Blender (since 2.80, I guess) use the word “(object) collection”. Does anybody know how is it called in ToonBoom Harmony or Moho? @Khemardi ? @KonstantinDmitriev ?
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They are still in synfig code XD
“Layer Collection” - I like this!
Yep, it sounds more logical.
We will have to update the documentation because we still have people following tutorials from last Ice Age giving up when then can’t find what they expect 
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Yes, this is so necessary and at same time boring…
Yes, so few tutorials out there… and most outdated.
We should fund some people to make short video tutorials and upload them to our YouTube (and/or yet nonexistent PeerTube) channel.
Waiting some more user opinions about my change proposal now 
They are called ‘Group Layers’ in Moho and Harmony. But I do agree that ‘Layer Collection‘ sounds like the most logical choice for our purposes.
