When you are admin of a closed group, you have to approve each member that want to enter the group. In addition, you are notified every time someone ask for approval. If you are admin of a large group, this can cause a significant amount of useless notifications, but I can't seem to find a way to disable them. They don't appear in the "all notifications" panel, and the notification menu doesn't seems to be listing specific notification types anymore. Setting the "notification for this group" to "off" doesn't help either.
Is there a way to disable the notifications that appear when someone want to join a closed group where you have admin rights?