Duplicate page redirect not working?

Question

htaccess

Guys, I have the following pages on my site:
https://site.ru/portfolio_page/kvartira-v-neoklassike/
https://site.ru/?portfolio_page=kvartira-v-neoklassike Of
course, this is the same page, but I don’t want to redirect from one to the other (however, other redirects work properly), I tried many different ways
, tell me how to fix such duplicate pages or how to set up a redirect?