Hi @Rao, Mayank
Uninstalling an unused SQL Server from your environment should not have any technical impact on the server side, as long as you have properly migrated any necessary data or services to another SQL Server instance.
However, it is always recommended to perform a backup of your databases before uninstalling SQL Server to ensure that you have a copy of your data in case of any unexpected issues.
It is also important to note that if you have any applications or services that are dependent on the SQL Server instance you are uninstalling, you will need to update their configuration settings to point to the new SQL Server instance.
Additionally, if you have any scheduled jobs or maintenance plans that are running on the SQL Server instance, you will need to update them accordingly.
For more information on uninstalling SQL Server, you can refer to the official Microsoft documentation on how to uninstall an existing instance of SQL Server setup: https://video2.skills-academy.com/en-us/sql/sql-server/install/uninstall-an-existing-instance-of-sql-server-setup?view=sql-server-ver16&tabs=Windows10
Thank you!