The new version of ArcGIS Urban (July 2021) introduces a simplified and more consistent interface for data exchange using the new ArcGIS Urban API (https://developers.arcgis.com/arcgis-urban-api/). This was necessary to allow seamless integration of ArcGIS Urban into a broader range of applications.
Please note that due to this automatic data exchange between CityEngine 2021.0 and ArcGIS Urban is temporarily unsupported for plans and projects that have been upgraded in ArcGIS Urban. Those items will not be displayed in the ArcGIS Urban tab of the CE Navigator anymore.

CityEngine 2021.0 users that need to sync their upgraded ArcGIS Urban projects and plans are encouraged to reach out to support or ask workflow-specific questions on ArcGIS CityEngine Questions.