Multiple leave chat
Enable multiple leave chats. When you have a lot of chats (hundred) and you want to leave all them to avoid noise, current UI is not allowing to leave all the chats in just one click. You need to go one by one and leave.
An option to "Purge" old group chats that have no activity >X months, not generating an alert when people leave groups with purge would stop it being annoying for everybody else in the group.