I haven't answered because I can't believe anyone would want to toggle the entire forum display. However, just in case that IS what you want, think for a minute about your request. If you toggle EVERYTHING, then you've toggled the toggle button as well, and you could never re-display the forum!
That's a simple CSS change. Find the rule for #widgetbar .module and replace position:absolute; with clear:left; and you should have what you want. You'll probably need to adjust the width of each widget block, because by doing this, the block will fill the length of the widget bar.