有两个选项，修改菜单链接href 属性或重定向主屏幕。

修改菜单更改全局变量$submenu. 此方法适用于单站点和多站点<问题：子菜单项Installed Plugins 不以粗体显示。

add_action( \'admin_head\', \'b5f_plugins_redirect_to_active\' );

function b5f_plugins_redirect_to_active() 
{
    global $submenu;
    $submenu[\'plugins.php\'][5][2] .= "?plugin_status=active";
    return;
}

重定向页面load-plugins.php. 需要多站点检测，但没有UI问题。

add_action( \'load-plugins.php\', \'b5f_ms_plugins_redirect_to_active\' );

function b5f_ms_plugins_redirect_to_active() 
{
    // Trick, plugin_status is only false in WP default screen
    // [\'action\'] prevents us interfering with activation/deactivation 
    if( isset( $_GET[\'plugin_status\'] ) || isset( $_GET[\'action\'] ) )
        return;

    // Check for MS dashboard, redirect accordingly
    if( is_network_admin() )
        wp_redirect( network_admin_url( \'plugins.php?plugin_status=active\' ) );
    else
        wp_redirect( admin_url( \'plugins.php?plugin_status=active\' ) );

    exit();
}

还有一些额外的东西：

1） 将主链接重命名为Active

add_action( \'admin_menu\', \'rename_submenu_item\', 99 );

function rename_submenu_item() 
{
    global $submenu;
    foreach( $submenu[\'plugins.php\'] as $key => $value )
    {
        if( in_array( \'activate_plugins\', $value ) ) 
            $submenu[\'plugins.php\'][$key][0] = __( \'Active\' );
    }
}

add_action( \'admin_menu\', \'menu_admin_wpse_44270\' );
add_action( \'admin_head-plugins.php\', \'highlight_menu_item_wpse_44270\' );

function menu_admin_wpse_44270() 
{
    add_submenu_page(
        \'plugins.php\',
        \'Drafts\', 
        \'<span id="my-all-plugins">All</span>\', 
        \'edit_pages\', 
        \'plugins.php?plugin_status=all\'
    );
}

function highlight_menu_item_wpse_44270()
{
    if( isset( $_GET[\'plugin_status\'] ) && \'all\' == $_GET[\'plugin_status\'] )
    {       
        ?>
        <script type="text/javascript">
            jQuery(document).ready( function($) 
            {
                var reference = $(\'#my-all-plugins\').parent().parent();
                // add highlighting to our custom submenu
                reference.addClass(\'current\');
                //remove higlighting from the default menu
                reference.parent().find(\'li:nth-child(2)\').removeClass(\'current\');             
            });     
        </script>
        <?php
    }
}