Hi,
had the some questions....
The private endpoint is used for the SHIR.
Support:
"Shared the below documentations and informed that we can still access the Azure Data Factory portal through a public network after you create private endpoint for portal.
https://learn.microsoft.com/en-us/azure/data-factory/data-factory-private-link
And if use SHIR or azure managed Vnet IR then the communication will happen via private link and use private IPs configured for their ADF."