How do I change discussion settings to manually mark discussion replies as read?
In discussion replies, a blue dot indicates the reply is new and unread. A white dot indicates a reply is read. When you navigate away from the Discussion or refresh the page, the blue dots will change to white dots indicating the replies are read.
You can tell Canvas not to automatically mark your Discussion replies as read so that you can manually control which replies you haven't viewed. By default, manually marking posts as read is turned off.