click the help button or hit F1 within sandbox for help
first off,
to move the window click anywhere within the image area or just about any blank area of the control panel and drag the mouse.
to resize the window, move the mouse pointer over the edge of the window (colored black by default, but this can be changed in the options) until it turns into a pair of opposed resize arrows, then click & drag to resize. if you're easily annoyed at having to grab onto a 1 pixel wide resize border, you can make the borders wider in the options.
sandbox uses a lot of shortcut keys to mirror its controls... for instance:
hitting the CTRL key shows & hides the control display on top of the image,
the ESC and BACKSPACE keys toggle fullscreen mode,
and the SPACE bar pauses and restarts the render.
there are a lot of other key commands, as well as commands available by messing around with the control panel and the settings within the options dialog.
and keep in mind that you can
right-click just about anything to bring up a popup menu.
and for those curious (since there's no obvious X button up in the corner),
to close sandbox hit the Q key or right-click to bring up the popup menu and click "exit".
oh yeah, and like i said before,
click the help button or hit F1 within sandbox for help
email
viscera@softhome.net if you have any problems or questions.