FreeGameDev

This forum doesn't scale itself to high resolution displays like other websites do. Maybe you could ask the 0 A.D. Forum people how they managed to work out their scaling. https://wildfiregames.com/forum/ Maybe it isn't a scaling problem but a default website sizing problem. But this forum is impossible to browse at 4k whereas that forum is perfectly fine, I only rarely encounter websites that are too small to read. This is one of them.

This should just be a question to switch to a newer forum software that has a responsive design. Sadly this is a bit complicated so we are preparing for a forum upgrade at a not too distant point in the future. Sorry for the inconvenience caused

Deleted.

0AD use a completely different forum software.

Have you tried hitting CTRL+ in your browser a few times? That will scale it nicely for me.