User control panel without text next to icons

-- HikaShop version -- : 4.0.0
-- Joomla version -- : 3.9
-- PHP version -- : 7.2

With the new Hikashop 4 the user control panel doesn't shows text beside the icons.

See screenshot.
We use Yootheme Pro template. When we delete all the custom CSS we still don't see any text beside the icons.
Please tell us how we can fix this.