By default, students cannot see each other's video submissions in Panopto. To allow students to see each other's videos in Panopto,
Go to the desired Panopto parent folder
Click the desired parent folder in Panopto.
Go to the desired Panopto [assignment] folder
Click the desired [assignment] folder in Panopto.
Open the [assignment] folder's Settings
Click the Settings button (a gear) on the desired [assignment] folder. The Settings window will appear.
Allow viewers to see each other's sessions
Click Settings [1], check the box for Allow viewers to see each other's sessions [2], and click the close X [3]. Students will now be able to view each other's videos submitted to the desired [assignment] folder.