To hide/show the Preview Window: Press and hold (\) and F4.
You can move, resize, or toggle (on/off) the Preview Window and Hot Key list.
The "interface" hot key (default is backslash \) should be pressed and held when moving or resizing the in-game objects. The interface key functions in the same manner as the Windows modifier keys Ctrl and Alt.
To move the preview window: Press and hold (\) and use the mouse to move the preview window anywhere within the game screen.
To resize the preview window: Press and hold (\) and move your mouse cursor around the edge of the preview window until the mouse cursor changes; then simply drag your mouse to increase or decrease the Preview Window.
You can also move the blue message boxes. The message boxes only appear for a duration of 5 seconds.
You can move and resize the hot key list the same manner.