If you are talking about how to avoid TD to cycle trough Mainscreen, Player rankings and seatingchart etc:
On the layout tab: press the "Screen sets" button.
You will now see a window with the screen sets (left pane) and screens (right pane) assigned to each screen set.
Choose/mark "default" in left pane and remove all screens except the "Main screen" in the right pane.
Now only the tournament screen will show once the tournament has started.