[RSS Feed/News] New Thread Modal - Two Columns

[XenForo]

Hi there.

I would like to know if there's a possibility with CSS to change the modal that appears when clicking "Post new Thread".
We have several categories and forums which makes it quickly a list of threads you can chose from, but scrolling through a modal is not a great user experience.
This is how it looks now:


See below what I tried myself;


I tried the above myself but it doesn't look that great, so maybe you guys can suggest some better alternative!

Thanks!

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