Cannot edit style.css from admin panel, because the template is looking for style.min.css

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Best practice is to use a child theme instead.

A plugin like Simple Custom CSS is another option.

Two alternate quick fixes:

  1. Disable the filter that selects style.min.css by commenting out this line in origin/library/function/styles.php:

    add_filter( 'stylesheet_uri', 'hybrid_min_stylesheet_uri', 10, 2 );

  2. Delete style.min.css 🙂

There is no auto-generation of minified files within WordPress.