When a MediaLab experiment is run, the window adjusts itself to the size that the current main window is at. If for example you have the main window maximized, the experiment will run full-screen. If the main MediaLab window is not maximized, the experiment will run at the size of the MediaLab window; however the experiment window will also center itself to the center of the screen.

Unfortunately, there currently isn't an option that can be used within the input files to denote where the window should be located at.