The thing that worked for me is
Fonts looks weird at Loki (and just in my user session!). How do I fix it?
But I got an error:
GLib-GIO-Message: 21:06:40.395: Using the 'memory' GSettings backend.
Your settings will not be saved or shared with other applications.
I solved it as described here https://blog.csdn.net/juwenkailaodi/article/details/86525841]
As mentioned here, the scrambled text in window titles might be due to a Screenshot utility 'conceal text' bug.
in Screenshot preferences window, turn off 'Conceal Text' option:
If this helps, please report this bug to elementary OS devs @ https://github.com/elementary