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<?php
//* Do NOT include the opening php tag, only copy the code below to functions.php file

if ( class_exists( 'WC_Appointments' ) ) {
    // Default Calendar view: 'day' or 'month'
    add_filter( 'woocommerce_appointments_calendar_view', 'appointments_default_view' );
    function appointments_default_view() {
        $default_view = 'day';
        return $default_view;
    }
}