Hi Norbert! @autall
You have reached the German community here, und so können wir das gerne auch auf Deutsch besprechen, but English is fine too. Don’t forget we have an English-speaking Design Forum here too in case you want to post your question there too.
And so you are trying to delete the “non-live” themes in your themes library, is that correct? What happens when you click here? Do you have a screenshot of what is happening?
Best,