The "Working Set" is a very old feature in Eclipse or other IDEs but there are many folks who don't use it and prefer to hide non-working project(s) by either closing the project(s) itself or deleting those from workspace especially when they have to demo something to someone. It is a super useful feature that lets you group your related projects to ease search and organize views within the IDE. Read here about what it is and how to use it: http://www.avajava.com/tutorials/lessons/what-is-a-working-set-and-how-do-i-use-it.html
A blog about my testing stories where I pen down my thoughts about test automation covering primarily Selenium, Java, Rest Assured, Karate, Maven, TestNG, Postman, newman, Jenkins, Git, Azure DevOps, etc.