While doing the Cypher Fundamentals course via URL
https://graphacademy.neo4j.com/courses/cypher-fundamentals/2-writing/8-c-merge-processing/
sandbox window is shown on the right side of the course.
But when any query is run on that window, or "Check Database" icon shown during the course is clicked, no results are shown in the sandbox window and the course considers that the query has not been run in the sandbox. How to get the query run in the sandbox successfully ?