There would be a button added somewhere where you could enter a username or user ID, similar to how you add people to dressup scenes. Entering a user would allow them to modify your groups and move pets between groups. They would not be able to trade or delete your pets, only move them.
If someone messed up your groups, there would also be an option to reset your groups to however they were before that person made their first change. There would also be an option to lock group settings. If a group's settings are locked, the sorter would not be able to move pets in or out of the group, change the group's trading settings, or rename the group. This removes most of the risk, so a pet sorting shop would be almost as safe as an art or coding shop.
Summary by Fireflii:
