MyBB Community Forums

So I use Shoutboxes! on my forum and be default they're too wide. So I go into the sideboxes.php files and resize them then unactivate then activate it but it breaks my site. The forum boards get really small then I have to uninstall every theme and reinstall it which is annoying. So does anyone know how to resize sideboxes?

Is there not any settings you can change? Customize -> Settings?

Idk, i don't use shoutboxes on my forums.
Usually if you install a shoutbox addon it comes with a settings page.