If you have any suggestions/feedback you want to bring to the devs' attention, here's your chance.

https://forums.crateentertainment.com/t/v1-1-9-2-discussion/108664

It seems the thread was closed there.

The UI scaling in Grim Dawn (1.1.9.1):

I have the 28" Samsung UHD monitor here with the native 3840x2160 at 60 Hz and i disliked the current UI scaling as it was set to max in the options menu that doesn't scale the UI in Main Menu, Options window and more otherwise in the in-game. It looks a bit too small to my eyes as it was not comfortable enough to read everything.
So... it's not HighDPI capable as i thought. Please consider about this and fix it as soon as possible.

Yes, it was only open for a few weeks.

You'd need to report it as a bug here

https://forums.crateentertainment.com/c/grimdawn/bug-reporting

Devs don't hang out on GOG.