Currently in the game, any friend that is on a team will be placed at the top of your list of friends. This can be annoying at times but it is possible to get an unaltered list by removing all friends from all teams. However, this is not possible right now, because Friends that were used in the previous Divergent Spirit event are still counted as being part of a team despite that team currently being uneditable.
As someone who likes to keep my UI as organized as possible, it is very annoying that the six Friends I happened to use in the last Divergent Spirit event are now permanently stapled to the top of Friend list with nothing I can do about it. I'm fairly certain that the Scarlet Devil Tower teams do not have this problem (they don't affect your friend list while the event is unavailable), so could we get that same fix for this event as well?
(Although, to be honest, I'm not sure why the Divergent Spirit event needed to use unique teams at all. The normal team system seems like it would have worked fine, and prevented this entire issue.)