Since version 184.108.40.206 of PrestaShop, the software's documentation is directly embedded into the 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 keep the column open until you have clicked to close it.
If the browser's display zone is less than 1220 pixels wide, then PrestaShop will open the contextual documentation in a new browser window rather than reducing the screen space dedicated to the main interface.
At the bottom of the help column, a small form enables you to tell the PrestaShop team whether the help section has been helpful to you or not. Rate the help page by clicking on one of the 5 levels of satisfaction. If you click on one of the two lowest levels, PrestaShop will open a short form for detailing your thoughts. You can either fill it out and click on the "Submit" button, or close the form by clicking on the cross, in which case only your rating will be sent to our server.