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Since version 1.6.0.7 of PrestaShop, the software's documentation is directly embedded into administration interface: clicking on the "Help" button from any back office page reduces the main interface's width in order to add a new column on the right, which contains the documentation for that section of the back - office.
Another click on the "Help" button closes the contextual help. If you do not close the help column, PrestaShop understands that you want it displayed on every page of the back office, and thus will maintain the column open until you have clicked to close it.
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