And just to add a little extra info, you can opt-out of these channel-wide mentions from your Preferences/Chat page ![:+1: :+1:](https://emoji.discourse-cdn.com/twitter/+1.png?v=12)
Though It reads like you opt-out of sending them, rather than receiving them ![:thinking: :thinking:](https://emoji.discourse-cdn.com/twitter/thinking.png?v=12)
I think Do not send notifications for channel-wide mentions (@here and @all)
should be 'Do not receive...'