In my most recent project, the Key is displaying in front of the Parent summary in the right side column of the issue. This means it's not possible to easily see the Parent summary (name).
In older projects (created a few weeks ago) this is not the case.
I've checked out the Parent summary, and it is not prepended with the Key.
Example of what I see in right side column when on any ticket assigned to a Parent. I can't see the name of the Parent!

What I see when I filter by Issue on 'Epic' (select box hasn't been updated to 'Parent' as yet). The Key is not part of the Summary.

Have I somehow changed the settings? Or is this a new 'feature'?