Each conversation with a tutor is a separate chat, listed beside the tutor.
Managing your chats
Open the tutor. Your conversations are listed on the left, and New chat starts a fresh one.
Starting a new chat is the right move after changing a tutor's settings, because an existing conversation keeps the old behaviour.
Deleting a chat
There is no delete control on a tutor chat at the moment. If you need a conversation removed, contact support and we will sort it out.

