When a group message is no longer pertinent, you can simply remove yourself in order to stop receiving notifications.
- Open the conversation you’d like to remove yourself from.
- Click on the three dots icon in the top right.
- Click on Add or remove members.
- Beside your own name, click Leave.
- Open the conversation you’d like to remove yourself from.
- Tap the three dots icon in the top right.
- Select Manage members from the menu.
- Long press on your own name.
- Tap the profile icon with a minus sign in the top right.
- Open the conversation you’d like to remove yourself from.
- Tap on the list of conversation participants at the top of the chat window.
- The details window will open.
- Find your own name, and beside it, tap the red profile with an x icon or tap Leave Conversation at the bottom of the screen.
Keep in mind that you can not leave a 1-on-1 message. But you can mute it if you'd like.