By default, the assignments still reviewed by the instructor are displayed in the "Assignments under review" tab.
To view all the assignments, including the ones that have already been reviewed, go to “Assignments under review” tab from the school's home page. In the filter menu on the right, you need to check “Yes” in the “Show reviewed” filter.
Once this filter is set, all reviewed assignments will also be displayed in the list.
Using the course selection filter and other filters, you can access reviewed assignments for each specific course.