Some applications, such as Perusall are automatically hidden from students. To make it visible and enable it for use, move Perusall to the main navigation area.
Step 1: Open your Canvas course
Step 2: Click settings at the bottom of the navigation.
Step 3: Open Navigation
Step 4: Use your mouse to drag Perusall to the main navigation menu.
Step 5: Click Save
Step 6: Perusall is ready for use is is listed in the main navigation of your course.