Location in WatchFast: File menu -> Program Settings -> Security
The Silent-Start feature is designed for cases where somebody might walk up behind you and look at your screen. If you have just launched the program, there is nothing you can do, even if you see the person coming. Software doesn’t respond to user commands while it is booting.
On Windows, WatchFast will start up minimized when Silent-Start is switched on. Then you can click on it in the task bar when the coast is clear. On the Mac, WatchFast will not open up any of its Players, and as soon as it is done launching will bring the Finder to the front. When you are ready, just click on it in the dock and open your Player(s).