This sounds like https://github.com/NodeBB/NodeBB/issues/5472, take a look at that issue and make the suggested changes.

Hey, I was wondering if you guys are still working on making the responsivness of the forum better? Most pages on the actual forum look alright, but the dashboard seems a bit unfinished on some pages. For example, the table on the manage users page is completely cut off on small screens. Also are there any major UI changes coming soon?

@yariplus Ahh, I'm sorry I was reading some stuff wrong. I got confused. This should be very helpful then.

You can modify a lot with the css editor in the acp