In the Card View Dashboard and the Recent Activity Dashboard, the sidebar contains a To Do list and other sections that help you know what assignments and events are coming up in all of your courses. The sidebar includes specific items for instructor and student roles. If you are enrolled in Canvas courses with more than one user role, your sidebar may show items for both roles.
The sidebar is similar to the sidebar that displays in your Course Home Page, but the course sidebar only includes items for the specific course. Depending on the setup of your Course Home Page, the sidebar in a course may contain additional sections than shown in the sidebar.
Note: You can also view items on the To Do list from the List View Dashboard.