I would like to recommend adding an option to exclude a constituent from a list by clicking the menu (three dots in circle) next to constituent profile picture. This would be a convenient way to exclude a constituent.

As you scroll down the list and see people that need to be excluded, it would make it a lot easier to take care of that when you are at the individual rather than having to scroll back up to the add/exclude button and then scroll back down to the place where you left off. This is particularly aggravating when working on long lists.