I too have same problem with Pro 2.1.0.
Asrujit SenGupta, both suggested workarounds doesn't work.
Ryan Bae - Alternate way I found was to create database connection using python window. This connection shows up 'GeoDatabase Connection Properties'.
import arcpy
arcpy.CreateDatabaseConnection_management("Path to your .sde file",
"connection_name.sde",
"DB",
"instance",
"DATABASE_AUTH",
"username",
"PWD",
"SAVE_USERNAME",
'TRANSACTIONAL');
Dan Patterson,Xander Bakker,Kory Kramer Can you kindly help?
arcgispro 2.1
utility network data model