Thanks a lot for your answer. That’s what I tried too but unfortunatelly I can’t see the Shortcod. It only shows a placeholder. See screenshot. Is this a bug in the plugin or the translation? Have made all updates from WooCommerce, WordPress and Plugins.
Another problem I’m facing is, that the form editor creates inline css styles which overwrites the theme styles. Other people seem to have the same problem and it let’s the forms look ugly. Eventhough if I have selected to take over theme styles it doesn’t actually do it.