I just wanted to point out, that unless @dcosgrove2 works at your school, it is not likely that she will see that option. That entire drop-down box list reflects sub-accounts created by your school. They are not Canvas standard.
At my own school for example, we do not use sub-aacounts, and we do not let users create their own courses.
Hello @dcosgrove2 Thank You for posting your question. I agree with @kmeeusen that your screen may look different than what @ashok_thapa provided in his screen shot. A few days ago, there was a similar question about sandbox courses that I helped answer, so I would like to point you to: Sandbox. I hope the information I've provided in that response would also help in your situation. But please feel free to post follow-up questions below if you still have questions about your own sandbox course. Thanks!