As you navigate the site you will find that subwindows will be opened to display some of the links etc. To return to the main window just click anywhere outside of the subwindow and the subwindow will disappear. If the subwindows do not appear at all then take a look at the "Troubleshooting" section. If the subwindows disappear unexpectedly it is most likely because you passed the mouse pointer over one of the menus at the top or side (subscription version only) of the screen. The site is designed to do this so that the subwindows to not obscure any menus. So take care not to move the mouse pointer over a menu while you are reading its contents.