Yes, you can! All the options you set when creating an assignment except the Delivery Method can be modified afterward, too. This includes turning on or off student tools (audio, drawing, etc.), the score display types, and whether students can check their work. There are two ways to change the assignment options:

From the Activities Page:

• Click the Activity name to see all the Assignments
• Click the 3-dot menu to the right of the assignment you wish to change
• Choose "Edit Assignment."

From the Assignment Detail Page (if you have already have the assignment open):

• Click the 3-dot menu at the top of the left-hand panel.
• Choose "Edit Assignment."