Text Guide
The Discussions/Announcements Redesign feature preview provides an updated, cleaner interface for course discussions in Canvas and a slightly modified layout for Announcements. It is not enabled by default at this time, but instructors can choose to enable it at any time on a course-by-course basis.
In the original Discussions view, all posts and replies are displayed in one long list, which can quickly become overwhelming with large discussions.
The Discussions Redesign collapses discussions so that only replies to the original forum prompt are displayed initially.
You can then click on the link with the number of replies which will open a side panel that displays replies to that particular post.