From the FAQ:
http://www.thetournamentdirector.net/faq.html#faq21If you are using an included layout, such as the built-in layout (BlueAndGreen.tlo), you will notice the screens change automatically. This can be prevented in two ways:
1. Lock the screen when the screen you wish to see is displayed. You can lock the screen by pressing Ctrl+L. Use Ctrl+L to unlock the screen after it has been locked.
2. Remove the additional screens from the layout's screen sets. On the Layout Tab, press the Screen Sets button. On the Screen Sets dialog, delete all of the screen sets except for the Default screen set. Then, delete each screen from the Default screen set that you do not wish to be displayed.