Prevent ArcGIS Online Portal connection

[SimonSchütte_ct]

Is there a setting or option using managed configurations to prevent users from connecting ArcGIS Pro with ArcGIS Online?
The goal is to force users to exclusively connect to one ArcGIS Enterprise Portal and nothing else.

Blocking ArcGIS Online through firewall settings is not wanted here, as ArcGIS Online should still be accessible via browser, but independently from ArcGIS Pro.

[SimonSchütte_ct]

Ok, seems to be possible with 

ARCGIS_CONNECTION

Specify whether a connection to www.arcgis.com will be available from the ArcGIS Pro Portals page. To include the connection, set this parameter to TRUE. If set to FALSE, the connection will not appear on the Portals page. Install ArcGIS Pro silently—ArcGIS Pro | Documentation