Stumbled upon this feature from dbForge:

https://docs.devart.com/sqlcomplete/setting-up-sql-complete/ssms-caption-options.html (adding the section "SSMS Caption" to Options making it possible to customize the pattern for the main window title.

I frequently use to instances of SSMS - one running under my standard account and one running with an elevated account. I would use a feature like SSMS Caption to make it easy to distinguish a window from the standard instance and a window from the elevated instance.