@jessie-k , you will be on the list again as soon as you join your team. (See @merlin ‘s link, above.)
Everyone else, now that teams have been assigned, people who have not joined their team’s Strava club have been moved from the People list over to the Friends list. As soon as you join your team’s Strava club, you will be back on the People list.
You can find out which team you are on at this link. If you then click on your team’s name on this page, you will get to the Strava club for your team, which you’ll need to join.