I am here for the same reason.
How the editor font can increase its size globally.
So, it is not so much friendly, this option? Yes because it is hidden beside of font selection and all users, eye scan settings for numbers 8, 10, 12 (which is the size).
It is something which need change? I don't think so.
After 2 eye scans of all settings, I google "How to change codeblock editor font size" and I am here!