I would to have the ability when looking at an entities setup page, to control what groups it beyond to. Add/remove for a group, even create a new group.
The way I work, with most automations acting on groups.
I often find it difficult to find the name of the entity within the group helper.
It would be simpler to located an entity via its integration or gui control, go to its setup, then add it to the group of interest. Much like how you can change an entities area from this form.
I never tried that, it looks possible, but would require creating a lot of new/sub-areas, as I don’t want all lights on in the living room when watching tv, just a sub-set (so create a new area). Then I can’t put this sub-area in the main-area. But I can put a group of lights, in another group of lights.