The chosen item will become the active window.
The Window menu will also show the Box Fractal window, the Tiling with Integer Matrices window, and the Tiling Options window when those windows are available.
You can maximize the size of the IFS, Fractal, and Design windows by choosing Maximize from the Window Menu. This will expand the size of the window to fill the screen. (The Maximize button is not available for these windows because maximizing one window that way maximizes all windows.) Choose Restore to reduce the window to its previous size.