You can use the CSS code below: 

#wpforo {
    width: ***90%;***
    margin: ***5px*** auto;
}

Change the red-marked values as you like. 

and 1 more question, what others theme install wordpress was good? is elementor support? 

Please read this support topic: https://wpforo.com/community/general-discussions/best-compatible-themes-for-wpforo/

The same question is discussed there. 

and 1 more question, what others theme install wordpress was good? is elementor support? 

Thanks

Simon

Could you please provide your forum URL to allow us to better understand the issue? 

Hello wpForo team,

I’m using WordPress + Blocksy theme + wpForo (latest version).

I’m facing an issue where wpForo pages always display in full width, even when the site and page layout are set to Boxed in Blocksy.

What I’ve tried:

• Blocksy → Customizer → Page Structure → Boxed layout ✅

• Adjusted max-width and content spacing in Blocksy ✅

• Added custom CSS targeting:

  • #wpforo-wrap

  • .ct-container

  • .ct-content

  • #content

• Tested on desktop and mobile

• Cleared cache and hard refreshed

Result:

• Blocksy layout works on normal pages

• wpForo pages ignore the boxed width and remain full-width

• Left and right spacing does not balance

• wpForo content stretches edge-to-edge

Expected behavior:

• wpForo pages should respect the theme’s boxed/container width

• Layout should look similar to wpforo.com/community (centered with margins on both sides)

Additional notes:

• I understand wpForo uses its own layout structure

• Is there an official wpForo setting, hook, or recommended container selector to control page width?

• Or a way to enable a native boxed / centered layout for wpForo pages?

Any guidance from the wpForo team would be appreciated.
Thank you for your great plugin and support.