Thanks for posting in the Community!
We understand that you are having some difficulty viewing Courses in the Calendar and we are glad to help!
Here are some references for using the Calendar as a Student in Canvas.
If you are having difficulty navigating or seeing your Courses in the Calendar after they are selected on the right had column, I would first troubleshoot by clearing cache and cookies in your respective browser.
Here are references for those steps if needed:
Hope this helps!