I'm sorry. I made a mistake, I shouldn't have responded to this post. I made a mistake pasting the answer. It should have been on another post.

There are no other application screens to show. The app consists of only one scene. However, it is used in specific events where there are explanatory panels. I have modified the description of the App by adding this information. The marker in reality is a background that occupies the entire wall. It may be that when testing with the marker on the monitor it is lost and the image disappears. I put the app under review again.