Question : I've SQL Server Management Studio (SSMS) installed and attempting to run it as a different user. I'm doing the Right Click on the ssms.exe - but can only see Run as Administrator , not Run as different user .
Answer: Run as different user is available It's actually available - but instead of Right Click , use Shift - Right Click .
The alternative is to run through the command line - which is my preference -
--example 1 : the full path to SSMS
--depending on ssms version it may differ on your desktop
RUNAS /user:MYDOMAIN\MYID "C:\Program Files (x86)\Microsoft SQL Server Management Studio 18\Common7\IDE\Ssms.exe"
--example 2 : using ssms shortcut
RUNAS /user:MYDOMAIN\MYID ssms
Read more on SSMS
How to start SSMS as Administrator
How to add SSMS to the PATH variable with Powershell