Column Widths

Hello sgower,
If you're talking about Recent Topics and My topics pages, its layout should be the same. See enclosed screenshot. I've made two screenshots and united them in one picture to show the width of the elements is the same. Here is the demo .
Do you mean these pages? If they looks different, probably it occurs due to Joomla template.
Please provide a link on your website to take a look and describe how to reproduce the issue there.

Unable to see My Topics page since the user should log in first. You can send credentials at This email address is being protected from spambots. You need JavaScript enabled to view it.

Hello Steve,
I compared these pages at your website and found little difference.
Well, actually we haven't had aim to make width of the columns equal at all pages since the it can depends from various factors (CSS rules of Joomla template or styles of 3rd party extensions that overrides Kunena template styles). As we can see - some external CSS rules influences on these layouts.

If it's important to make these columns equal by width, we'll need temporary access on your website (FTP & admin back-end) to need to examine the structure of the site at back-end side, which extensions are in use, etc.