Remove Callouts from Left - Right Catalog Columns
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You can remove the Magento default callouts from either the left or right column copying the 2 files named left_col.phtml and right_col.phtml located in default/template/callouts to (your theme)/template/callouts
Then edit the two files and remove all content. If you haven’t a custom theme, just delete the content of the two files in the original position.