If you are experiencing issues on a page and want to rule out that the custom CSS and JavaScript created by using Design Tools is the problem, you can append ?global_includes=0 to the page's url and see the content without any of the Cidi Labs code running.
Here are a couple examples:
https://cidilabs.instructure.com/courses/123/pages/my-page?global_includes=0
https://cidilabs.instructure.com/courses/123/assignments/1234?global_includes=0
If you are still experiencing the issue when viewing it through the appended url, the problem is being caused by something other than Design Tools code.