Group chats in iMessage are great, until they start bombarding you with alerts and reports. Even if you mute a group chat in Apple Messages, you will still receive notifications when your name is mentioned. Here's how to turn off iMessage reports on iPhone and iPad.
Starting from iOS 14 and iPadOS 14, Apple has made some changes to the way iMessage group chats work. Although you can mute group chats, the Messages app still sends notifications when someone mentions you.
From the Settings app, you can turn off notifications for all reports.
Scroll down to the "Mentions" section and tap the switch next to "Notify Me". Make sure the setting is off.
Now, you will not be notified when someone mentions you in any iMessage group chat.
To completely mute a group chat in iMessage, you need to use the "Messages" application.
Open an iMessage group chat and tap the "Arrow" icon at the top of the chat.
Now, select the "Info" button.
From the chat settings menu, swipe down and press the toggle button next to “Hide Alerts”.
You have now completely muted an iMessage group chat. You will not receive notifications from the group chat, including reports.
Photo source: howtogeek.com