We just resolved this issue on our Monterey machine by going to the menu, choosing "Format", "Font", and "Show Fonts". In the font dialog that appears, we then only had to choose a font family (Arial, anyone? :), and the text appeared readably rendered. The "English" Collection was already selected; you may need to manually select it.
You should be able to experiment with different font faces, sizes, etc. to find a combination for your liking.
And in our experimenting, the font setting was retained after relaunching Horos.
Hope this helps!
Best,
I have the same problem as Reinaldo posted below (attached image). Sorry for posting again, but I might have missed if anyone has replied with a solution?
Regards