I am planning to share story maps with my team on Monday. When building a practice map today, I discovered that this icon is at the top of the map:

Does anyone know how to get rid of it? I've researched it but have been unable so far to figure out how to remove it or show it in a different view so that the audience won't see the "switch to builder mode" rectangle. I didn't remember seeing it before. If anyone can share how to present the map without seeing this, I would appreciate it.