Hello @Shngz,
You should contact to Fancy product designer developers and ask them for the best solution they can propose to make compatible with our Single Product builder. According to the fact it is builder we have our own hooks and each of them is related to specific content showing case (etheme_woocommerce_template_single_title will show product title)
The full list of hooks is public and you may find them here -> https://xstore.helpscoutdocs.com/article/123-single-product-builder-hooks
We don’t have those hooks in our builder due to described above reasons
1/ woocommerce_before_single_product_summary
2/ woocommerce_single_product_summary
3/ woocommerce_after_single_product_summary
4/ woocommerce_share
So you have a few variants to solve this
1/ to disable Single Product builder
2/ to contact with Plugins Author and ask them for the best solution (if such one will be found then we could add it globally)
3/ rewrite xstore/woocommerce/content-single-product-builder.php to your child-theme and add actions you need to have for such compatibility
If you have archive of Fancy product designer plugin you may send us a link to download it in private area or on our support email -> 8themes@gmail.com. In such case, we could check for compatibility from our side (if such one could be able to add)
Regards