In order to make child theme changes to work when Minifiy option is enabled, check the following steps: Create style.min.css file by copying css from style.css file and convert it. We created style.min.css  using this site: https://cssminifier.com/  Upload style.min.css file in child theme folder. 2. Replace get_template_directory_uri from child theme with get_stylesheet_directory_uri 3. Replace style.css with style.min.css