Sublime Text 3 how to change the font face of the file sidebar?

The answers are omitting the square brackets, in the case one is creating the file from scratch.

To recap, for the ST3 users who don’t have the Default.sublime-theme file (which is actually the default configuration), the simplest procedure is:

1. Navigate to Sublime Text -> Preferences -> Browse Packages
2. Open the User directory
3. Create a file named Default.sublime-theme (if you’re using the default theme, otherwise use the theme name, e.g. Material-Theme-Darker.sublime-theme) with the following content (modify font.face as required):

[
    {
        "class": "sidebar_label",
        "color": [0, 0, 0],
        "font.face": "PragmataPro",
        "font.size": 12
    }
]