Admin CP > Styles & Templates > Style Manager > on drop down menu for your style select stylevars > type doc in input box top left of new window (Style Variable Editor) > click doc_maxWidth > select units (eg pixels) and type size (width eg. 950).
If auto is in Size box the page will extend to full screen width. If you select % and say 75, your page will fill 75% of the screen but still fluid. I suggest you experiment.
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