Page as Category not working

Hi,
I have my own page as category and saw errors at google search console.
There was /category/ included to the links and that giving an error.

I decided to use your plugin but after activating it my page as category switched to the normal category page which is looking bad. How can I avoid that and showing the normal page as category with removing the /category/ slug from urls?

Thx for response.

Best wishes,
mistacup