On the Delphinium page, in Teacher or Periscope View, click the Settings icon in the top right corner of the page
The "Settings" dialog will open.
Currently Hidden Columns
Show/Hide Links to Assignments in Student View
In the student view of the Delphinium gradebook, there is a list of assignments. This setting governs whether the names for those assignments will also be links to those assignments in canvas. If teachers are trying to enforce that students access assignments through a different part of the delphinium layout, they may uncheck this box and the assignment names in the student version of the gradebook will be text only, without links to the assignments.