Hi,
About the breadcrumb, it's possible that it became "tiny" due to the setting "Simplified breadcrumbs " in the HikaShop configuration (Features / SEF url options).
About the display of the category above the product name ; there is no option to do that but you can add it thanks to a view override.
By overriding the product page (product / show or product / show_default) you can display the name of the first category of a product.
You can access to the categories of the current product thanks to
It contains an array of category objects. And you can use it, like that
echo $this->categories[0]->category_name;
Regards,