@shirleyl open up your theme’s full-width page template and save as buddypress.php and upload this file to your theme folder in server wp-content/themes/yourthemename/
Do the same for bbPress, create a new file bbpress.php from full-width theme template and upload same to theme folder in server.
Know that the full-width with apply to all BP and bbPress templates. If you want different layouts for each BP component, read this https://codex.buddypress.org/developer/theme-development/a-quick-look-at-1-7-theme-compatibility/
