CSD Unit 3 Game Development Help!

So my students are developing their games right now and I am having trouble with this one. https://studio.code.org/projects/gamelab/Mf-F-_Nt9Bkr6sulm8FyslLwiuJoUbNPY5AIDD9sMtM
I would like the blue screen to stay after you click the start button as well as when you are clicking it. Does anyone know how we might do this?