To accomplish this, you will want to follow these steps:
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Navigate to Administrator → Extensions → Templates Manager and select the template you are currently using as your default.
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Navigate to the Layout tab.
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Add the number for the Page Width you want to have for your site in px.
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In Page Align select Left , Right, or Center depending where you want to position your site.
- For SECTION MAIN CONTENT select the style for 2 columns and 3 columns.
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Also select for each part of the template the style for 2 columns, 3 and 4 columns.
- Click Save button
Your site will get the layout you select.