To remove files from devices, simply unassign the file(s) from the device group or class. Select one or more files and use the Unassign button.
From the pop up window, select the groups you wish to unassign the file(s) from. Use the tabs at the top to select from schools, groups or classes. Once you are done, click the Unassign button at the bottom right corner.
Note
Books that are currently assigned to devices cannot be removed from the list