Hello, @villeruti,
If you do not want to use the block and want to show the Category description directly when adding to the Product Category, then you should create a Custom Layout for your Product Category.
Please navigate to Porto >> Template Builder >> Product Archives and create the new template there, then you can import the pre-built layout using Porto Studio: https://postimg.cc/JyTSbnM9
After that, you should use the “Archive Description” element at any place where you want to show the description: https://postimg.cc/McFqztMM
And then set the condition to apply that layout to your site product categories pages: https://postimg.cc/NKtzrTqN & https://postimg.cc/Sn8YH2np
Finally publish that layout.
And then the Description you will set from the backend of the product category page will show on the product category pages adapting the layout you created: https://postimg.cc/SnFxYmrS
I hope this clarifies everything.
Best Regards,
PThemes Team.