Some pages not display correctly, according to DISPLAY CONDITIONS

[LRA21]

I put a shortcode with phpBB forum in a template, but the page does not display correctly, according to DISPLAY CONDITIONS, on all displayed pages. On some of them it is displayed correctly (ex: forums), but on others, for example TOPIC, or USER, it no longer displays the look I set in the template. It is displayed the full width of the page, even if we set it to appear streched and no longer displays the other visual elements in the template page.
How could I condition the other generated pages to use this template format?
Thanks!