Trying to Summon Broomstick - cant open objects tray! please help

My kids are using their Harry Potter Coding Wand. They are on the Quiddich Pitch challenge where they have to summon a broomstick. We are able to open the EVENTS folder on the top left and drag the coding block into the space. But when the directions say to open the next folder underneath (the OBJECTS folder), nothing happens. We have closed and reopened, restarted…nothing. It just continually blinks that orange dot to show us that this is the next step, but doesn’t allow us to do it. Any ideas? Thank you!