No, you’re not able to do this. The reason is because in this instance the theme just calls
get_categories with no parameters passed in. By default WordPress has this setup to not return categories that are empty, but this can be changed by passing in the
hide_empty argument as false.
Unfortunately there is no filter or anything in the theme that will allow you to change this from your Child theme. You can see where this happens on around line 666 of /framework/admin/functions/display.php.