bbPress.org

create a bbpress.php and remove any post meta code like by (author) published (post date)

basically your theme thinks that the bbPress archive page is a blog post so it structures it like so , it keeps the forum limit low as if it was an excerpt.

https://codex.bbpress.org/theme-compatibility/getting-started-in-modifying-the-main-bbpress-template/

this plugin will help you find the file you would need to copy and create a bbpress.php file from.

https://wordpress.org/plugins/what-the-file/