I was able to fix this with the following settings in Avada.
Using a layout for Forums (bbPress has sort of inbuild support)
Added a title and a content container with my layout settings
Set the “Forum” layout configuration to include All Forums, Forum, and important selecting all Children of Specific Forums.
For the forum index I use a custom page with manual added links to all forums.
Clarification, I did not reset the forum, used the repair and upgrade tool.
which latest releases?
I’ve tried both from here https://bbpress.org/download/
In the meantime I have switched from Elementor to Avada (largest WP template), same issue. The index is fine but viewing a forum or topic the root dir setup is gone, i.e. forum stretches the entire content area and no sidebar or containers.
Since the bbPress install was 9 years ago also used the tools to reset everything.
The problem appears to be that bbPress (or the latest WordPress 6.2.2) is not considering the root dir setup.
May be related https://core.trac.wordpress.org/ticket/58366
