Steps to reproduce it:
- Windows 10 PC in a workgroup and SSMS v18.1
- Use runas to start SSMS with domain login account. Example: runas.exe /netonly /user:[domainname\username] ssms.exe
- Connect to SQL Server with windows authentication
- Connect to another SQL Server with SQL authentication and make sure its marked/selected
- Click on “New Query”-> new query window will open with a login dialog.
- Try to close the login dialog, it won’t close.