A PrestaShop BackOffice window will open up for each of the duplicated product. This is to confirm the duplication has been successful.
You can duplicate as many products as you wish in a single action simply by setting up the maximum of products you wish to duplicate in Tools > Settings > Maximum.
Note that the duplication is a PrestaShop process. If for any reason the duplication does not work or some elements are not duplicated during the process, then please refer to PrestaShop documentation on the duplication option.
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