Today I got answer from Matlab:
"The new Editor is using a web-based UI technology rather than Java swing. As a result, fonts are rendered differently. In addition, the default font has been changed to a more modern one. Therefore, it is not a bug, but expected behavior.
If you prefer the old font, you can get closer to it by going to "Preferences > Fonts" and adjusting the font. On Windows, picking "Courier New" will be closest to the old font."
I picked "Courier New" and it looks very similat to old Editor Font