When using privacy-related apps such as banking and transactional services, as well as preview screenshots saved by the camera, they appear in the background task card. To protect your privacy, the app in Recents will be blurred automatically.
To enable this function, please refer to the following steps:
Go to the [Settings] app >> [Home screen] >> [Arrange items in Recents] >> [Blur app previews] >> select apps for which previews will be blurred in Recents.