This article helps you to understand how to enable Windows Authentication in Workflow manager.
With single sign-on (Windows Authentication), you will be automatically logged in to Workflow Manager / AdminStudio Enterprise Server using your domain credentials, as long as your domain account has been imported into the system.
Once single sign-on has been set up and your account has been imported, when you next open Workflow Manager / AdminStudio Enterprise Server, the IIS web server checks to see if your domain credentials are valid in the Active Directory domain server. If they are valid, you will automatically be logged in to Workflow Manager / AdminStudio Enterprise Server.
The below video has step by step process which will guide you to set up Windows Authentication. Also attached the video for reference.