add featured image fields on post list

// Add Featured Image column before Title in the Posts list
add_filter(
    'manage_edit-post_columns',
    function ( $columns ) {
        $new = array();
        foreach ( $columns as $key => $label ) {
            if ( 'title' === $key ) {
                $new['featured_image'] = __( 'Featured Image', 'jnews' );
            }
            $new[ $key ] = $label;
        }
        return $new;
    },
    20
);

// Output Featured Image in the column
add_action(
    'manage_post_posts_custom_column',
    function ( $column, $post_id ) {
        if ( 'featured_image' === $column ) {
            $thumb = get_the_post_thumbnail(
                $post_id,
                array( 60, 60 ),
                array(
                    'style' => 'display:block;width:60px;height:60px;object-fit:cover;border-radius:6px;',
                    'alt'   => get_the_title( $post_id ),
                )
            );
            echo $thumb ?: '<span style="opacity:.6;">—</span>';
        }
    },
    10,
    2
);

// Adjust column width and alignment
add_action(
    'admin_head-edit.php',
    function () {
        echo '<style>.column-featured_image{width:72px;text-align:center}</style>';
    }
);