How to set a specific image in a group/stack of images

Hi, I’m using groups to stack images to culling faster. I’d like to set a specific image of the group as the main picture, but I cannot find a way to do it.
Naively, I tried ‘Set as Album thumbnail’ but it set the cover thumbnail of the album (and there is no way to remove it).
Am I missing something?
Thanks for any help.

Edit: when the group is open is not possible to understand which are the images part of the group; I tried to change theme but looks like theme isn’t impacting this feature. If not a bug, definitely will be a UX improvement.

I usually select all the images I want to group, then lastly, holding down ctrl, I deselect and reselect the image I want to represent the group and that’s it.

Thanks, it’s good suggestion :slight_smile: I didn’t thought about it.

It’d be great to have a promote/demote option to sort images in the group to have the possibility to sort the group by preferences (it was a great feature in Aperture)