Już poradziłem sobie z tym problemem, dla tych w przyszłości jakby szukali:
edytować plik
themes/prestashop/category.tpl
i wywalić
<ul class="inline_list">
{foreach from=$subcategories item=subcategory}
<li>
<a href="{$link->getCategoryLink($subcategory.id_category, $subcategory.link_rewrite)|escape:'htmlall':'UTF-8'}" title="{$subcategory.name|escape:'htmlall':'UTF-8'}">
{if $subcategory.id_image}
<img src="{$link->getCatImageLink($subcategory.link_rewrite, $subcategory.id_image, 'medium')}" alt="" />
{else}
<img src="{$img_cat_dir}default-medium.jpg" alt="" />
{/if}
</a>
<br />
<a href="{$link->getCategoryLink($subcategory.id_category, $subcategory.link_rewrite)|escape:'htmlall':'UTF-8'}">{$subcategory.name|escape:'htmlall':'UTF-8'}</a>
</li>
{/foreach}
</ul>