I have edited colour scheme and fonts in PS. Changed to JetBrains Mono.
Problem is: The default text seems bold and config says it is not.
Have a look at the white text. It is bold or semibold.
Menlo seems to have the same issue, but with Monaco font the default text looks "regular".
In Preferences "Main weight" is set to "Regular". And "Editor > Color Scheme > General > Text > Default text" is not marked as "Bold". When I change "Main weight" to thin, there is still a gap between default and other text. And changing "Bold weight" to thin it effects exactly the white text. So, PS is using bold font there.