Fix 'Last Post' text from cutting off

Currently the Date/Username gets cut off from the 'Last Post' bit. I am using a custom theme, UI.X 2, and documentation doesn't mention anything, I mentioned this to the developers and they told me it's not an issue and that I need to use custom CSS..

Below is the default last post bit arrangement. Is there any way to fix this issue? Or change it to the latter?

Current layout
Code:

Code:

Thread Title
Saturday at 9:00 AM Username

Change to
Code:

Code:

Thread Title
By...

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source https://xfworld.net/threads/fix-last-post-text-from-cutting-off.47225/