So basically, as an example, you want the forum part to always stay at 800px and then the whole site width increase by the width of the sidebar (like to 1000px when the sidebar is on, but it would be 800px when then sidebar is collapsed)? There is no way to do that. The only thing I can think that you could do is have one style with the sidebar (extra wide) and then another style where you have edited the template and removed the sidebar (not so wide) and users would switch back and forth between styles if they want the sidebar on/off.
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