Though I have tried to modify \"font.size\" in classes like \"Label_control\" and \"sidebar_control\" in the Package \"Theme-Default\", the font size of the editor does not
If you want to change the font size then simply follow. Preferences-> Default File preferences.
After clicking on default file preferences, new Tab will open with name of Default File Type.Sublime-options
After find Font properties like font Courier New 12 we (recommend to use CTRL+F) then change size of it. Click save and instantly you can see the changes.