Exit node group by clicking the parent at the top of the Shader Editor

Currently to exit a node group you have to press Tab. It's a non-intuitive UI, and not very discoverable (and it doesn't help that in the menu, the command is labeled "Edit Group" no matter whether you're opening the group or going out of it).

Nested groups make things even more confusing, because the same Tab key is used to go into a child group or a parent group.

Why not make the group names in this header clickable?

Intuitive, discoverable, lovely.

(Also, is there a great reason to show the object and mesh names in that header? Forgive me if I'm missing something there.)