Was muss im MS Purview einstellen damit ich auch diese Vertraulichkeitsbezeichnung

Hello! Thanks for reaching out. Are you looking for how to apply content markings? If so here is some helpful documentation to help you get started-https://learn.microsoft.com/en-us/purview/sensitivity-labels#what-sensitivity-labels-can-do
Please take note of the limitation for content markings since they can only be applied to documents and Loop component and pages.

For more information, see Content markings with variables.

Need to check when content markings are applied? See When Office apps apply content marking and encryption.