When creating a group of lights in Helper, the Options allows you to toggle the Hide Members.
I assume hiding members doesn’t show you entities when you use the More Info popup, but even if you don’t Hide Members, the group of lights doesn’t show the member entities when you view them.
It used to work this way for the old yaml method, and was handy when you wanted to only turn on certain lights (or when one light was playing up and not wanting to turn on/off correctly).