In Adobe Illustrator (2020) one can organize elements in the layer panel in 2 ways (AFAIK) : layers or groups.
The behaviour is slightly different for both.
- To select elements : when arranged in layers, a single click is enough to select an element, when an element is inside a group, a double-click is needed and you can then select the element in Isolation mode.
- To move elements : grouped elements move altogether whereas elements in same layer can move independently (this is logical).
My question is : how to distinguish in the Layers Panel if a container is a group or a layer ? Indeed, when elements are grouped a container is created with brackets in its name, however once renamed there is no way to my knowledge to distinguish it from a layer.