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Layout Templates allow you to choose how portlets will be arranged on a page. They are simple table or CSS-based containers into which portlets can be dropped and sit within the body of the page. Liferay Portal comes with several built-in layout templates, 20-80 Layout is something which is not available out of box in liferay portal. This layout will provide 20-80 columns structure for portlet arrangement in a portal page.

This layout will appear in your Page Layouts once installed.