This site is based on a "responsive design," which means that it can automatically reformat to your screen size.
You're seeing this message because you are viewing the site on a desktop or notebook screen and, at some point, you changed the size of your browser window. At this browser size, to better fit your screen, you might prefer the site to reformat to "mobile view."
We recognize, however, that some people may prefer the site to stay "as is" (i.e., not to respond) and remain in "desktop view."
So, we've put in this tool that allows you to choose whichever view you'd prefer. By all means, try them both out!