Modify the catalog.xml file from / app / design / frontend / your_theme /default/layout/catalog.xml and add a new link in the default block block
<default> ... <reference name="root"> <action method="setTemplate"> <template>page/2columns-right.phtml</template> </action> </reference> ... </default>
Thus, you overwrite the root block in the page.xml file (the main Magento layout file is loaded)
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