You can choose to leave a chat that you are part of at any time.
To leave a chat:
- Go to your Chats.
- Find the chat you don't want to be part of anymore.
- Open it and tap Ⓘ in the upper-right corner to open the Chat info. OR Simply swipe it left without opening until you see Leave on the right.
- Tap Leave chat / Leave. The pop-up confirmation will appear.
- Tap Leave chat.