Thank you very much for your advices.
This really change root forum page for my own page, but I thought if is possible simply change style from archive for example to post or page. I want to only change wordpress style format but forum content preserve. I use this theme https://www.designwall.com/wordpress/themes/wallpress/ and this theme has archive divided to some parts and forum is bigger than one archive part, therefore I need change style to classic post or page.
