I built a Web App using the Basic Viewer in ArcGIS Online. I have added the legend tool to the toolbar. However, what I have noticed is once that tool is opened the end user can't close it. I have tried this with one to several tools on the toolbar. You can switch between the tools but you can not close them. The problem I see with this is when you are on a 8" or 10" phone that tool takes up a lot real estate on the screen and map. On the Web AppBuilder applications, once you open a tool you can close them by clicking an X or by clicking the button again. Is this a bug with the Basic Viewer or something that has been an oversight and needs to be placed as a feature request?