I have unread notification (blue dot on the bell) from the issue on the repo that’s under DMCA right now.
How to mark it read when my both Inbox and Participating lists are empty (but have an “1” next to text)?
You can try “mark all as read” but if that doesn’t work, you’d have to open a ticket. If it’s your repository that is DMCA’d then you can ask for it to be deleted.
I can’t see such button. Select all checkbox does nothing. The repo was not mine, I’m only answered in the one of the issues.