The upcoming release 28 includes a complete overhaul of the text rendering. You might want to try out its current release candidate to check if that further improves the situation (don't forget to disable the mod before doing so).

Thanks for the quick response. It didn't completely solve the problem, but it definitely improved it.

I'm using the latest version 27.1 on a 4K monitor on Mac OS and everything looks great, except for the text, which is pixelated for some reason and has artifacts around it. Also, a thin line appears on the buttons. Thank you for looking into the error.

1-st map autoselected by the game, tried also mainland with the same result. the game installed via .dmg file.