How to make the Prestashop 1.7 Classic (default) theme display the thumbnail uploaded for category when displayed as a subcategory.

Edit the sub category template file 

/themes/classic/templates/catalog/_partials/subcategories.tpl

Edit the following line to make the image url point to the thumbnail image

{if !empty($subcategory.image.large.url)}

<img class="replace-2x" src="{$subcategory.image.small.url}" alt="{$subcategory.name|escape:'html':'UTF-8'}" loading="lazy" width="141" height="180"/>

{/if}

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