Canvas has rearranged the student navigation buttons to make certain functions more closely associated with the most frequently used features in Speedgrader. The less frequently used navigation buttons have been shifted to the left side of the menubar: gradebook, mute the assignment, keyboard shortcuts, help menu, and gradebook settings. Assignment details and grading statistics are located in the middle of the menu bar. View the image below to observe the changes:
The 3 minute 12 second screencast walks you through the process of grading with Speedgrader showing the new navigational features.