Say https://www.eyewearuk.com/,  the theme outputs all the static file to: <link rel=”stylesheet” type=”text/css” media=”all” href=”https://www.eyewearuk.com/pub/static/version1618304858/frontend/Mgs/cheapglasses/en_US/mage/calendar.css” /> <link rel=”stylesheet” type=”text/css” media=”all” href=”https://www.eyewearuk.com/pub/static/version1618304858/frontend/Mgs/cheapglasses/en_US/MGS_Mpanel/css/owl.carousel.css” /> <link rel=”stylesheet” type=”text/css” media=”all” href=”https://www.eyewearuk.com/pub/static/version1618304858/frontend/Mgs/cheapglasses/en_US/MGS_Mpanel/css/owl.theme.min.css” /> <link rel=”stylesheet” type=”text/css” media=”all” href=”https://www.eyewearuk.com/pub/static/version1618304858/frontend/Mgs/cheapglasses/en_US/MGS_Mpanel/css/animate.css” /> <link rel=”stylesheet” type=”text/css” media=”all” href=”https://www.eyewearuk.com/pub/static/version1618304858/frontend/Mgs/cheapglasses/en_US/MGS_Mpanel/css/magnific-popup.css” />… Read moreHow to change the locale code for a theme in magento 2?