I use this, only add to the original code. it’s 2 functions and filters:

function register_sortable_columns( $columns ) {
$columns[‘post_views’] = ‘post_views’;
return $columns;
}
add_filter( ‘manage_edit-post_sortable_columns’, ‘register_sortable_columns’ );

function views_columns_orderby( $vars ) {
if ( isset( $vars[‘orderby’] ) && ‘views’ === $vars[‘orderby’] ) {
$vars = array_merge( $vars,
array(
‘meta_key’ => ‘post_views’,
‘orderby’ => ‘meta_value_num’,
)
);
}
return $vars;
}
add_filter( ‘request’, ‘views_columns_orderby’ );