Customization guide for extensions:

SEO Layered Navigation Plus

Drop-Down List for Magento Layered Navigation

Sometimes it is useful to display filter label instead of --All-- in drop-down filter in Layered Navigation, especially when using it as horizontal filter menu above products.

Copy app\design\frontend\base\default\template\manapro\filterdropdown\items.phtml

To app\design\frontend\YOUR_PACKAGE\YOUR_THEME\template\manapro\filterdropdown\items.phtml

Open it for editing and replace

__(' -- All --')