To adjust the notifications you're getting from a conversation:
Desktop:
1. Open the conversation.
2. Click Settings icon on the top right corner.
3. Under the SEND NOTIFICATION FOR you'll find the different options to set for your conversation notifications.
Mobile:
1. Open the conversation.
2. Tap Settings icon on the top right corner.
3. Tap on the Notifications tab, here you'll find different options to set for your conversation notifications.